Abstractile Generates mosaic patterns of interlocking tiles. Written by Steve Sundstrom; 2004.	Anemone Wiggling tentacles. Written by Gabriel Finch; 2002.
Anemotaxis Anemotaxis demonstrates a search algorithm designed for locating a source of odor in turbulent atmosphere. The searcher is able to sense the odor and determine local instantaneous wind direction. The goal is to find the source in the shortest mean time. Written by Eugene Balkovsky; 2004.	Ant A cellular automaton that is really a two-dimensional Turing machine: as the heads ("ants") walk along the screen, they change pixel values in their path. Then, as they pass over changed pixels, their behavior is influenced. Written by David Bagley; 1997.
AntInspect Draws a trio of ants moving their spheres around a circle. Written by Blair Tennessy; 2004.	AntMaze Draws a few views of a few ants walking around in a simple maze. Written by Blair Tennessy; 2005.
AntSpotlight Draws an ant (with a headlight) who walks on top of an image of your desktop or other image. Written by Blair Tennessy; 2003.	Apollonian Packs a large circle with smaller circles, demonstrating the Descartes Circle Theorem. Written by Allan R. Wilks and David Bagley; 2002.
Apple ][ Simulates an original Apple ][ Plus computer in all its 1979 glory. It also reproduces the appearance of display on a color television set of the period. In "Basic Programming Mode", a simulated user types in a BASIC program and runs it. In "Text Mode", it displays the output of a program, or the contents of a file or URL. In "Slideshow Mode", it chooses random images and displays them within the limitations of the Apple ][ display hardware. (Six available colors in hi-res mode!) Written by Trevor Blackwell; 2003.	Atlantis A 3D animation of a number of sharks, dolphins, and whales. Written by Mark Kilgard; 1998.
Attraction Uses a simple simple motion model to generate many different display modes. The control points attract each other up to a certain distance, and then begin to repel each other. The attraction/repulsion is proportional to the distance between any two particles, similar to the strong and weak nuclear forces. Written by Jamie Zawinski and John Pezaris; 1992.	Atunnel Draws an animation of a textured tunnel in GL. Written by Eric Lassauge and Roman Podobedov; 2003.
Barcode Draws a random sequence of colorful barcodes scrolling across your screen. CONSUME! Written by Dan Bornstein; 2003.	Blaster Draws a simulation of flying space-combat robots (cleverly disguised as colored circles) doing battle in front of a moving star field. Written by Jonathan Lin; 1999.
BlinkBox Shows a ball contained inside of a bounding box. Colored blocks blink in when the ball hits the edges. Written by Jeremy English; 2003.	BlitSpin Repeatedly rotates a bitmap by 90 degrees by using logical operations: the bitmap is divided into quadrants, and the quadrants are shifted clockwise. Then the same thing is done again with progressively smaller quadrants, except that all sub-quadrants of a given size are rotated in parallel. As you watch it, the image appears to dissolve into static and then reconstitute itself, but rotated. Written by Jamie Zawinski; 1992.
BlockTube Draws a swirling, falling tunnel of reflective slabs. They fade from hue to hue. Written by Lars R. Damerow; 2003.	Boing This bouncing ball is a clone of the first graphics demo for the Amiga 1000, which was written by Dale Luck and RJ Mical during a break at the 1984 Consumer Electronics Show (or so the legend goes.) This looks like the original Amiga demo if you turn off "smoothing" and "lighting" and turn on "scanlines". Written by Jamie Zawinski; 2005.
Bouboule This draws what looks like a spinning, deforming balloon with varying-sized spots painted on its invisible surface. Written by Jeremie Petit; 1997.	BouncingCow A Cow. A Trampoline. Together, they fight crime. Written by Jamie Zawinski; 2003.
Boxed Draws a box full of 3D bouncing balls that explode. Written by Sander van Grieken; 2002.	BoxFit Packs the screen with growing squares or circles, colored according to a horizontal or vertical gradient, or according to the colors of the desktop or a loaded image file. The objects grow until they touch, then stop. When the screen is full, they shrink away and the process restarts. Written by Jamie Zawinski; 2005.
Braid Draws random color-cycling inter-braided concentric circles. Written by John Neil; 1997.	BSOD BSOD stands for "Blue Screen of Death". The finest in personal computer emulation, this program simulates popular screen savers from a number of less robust operating systems. Written by Jamie Zawinski; 1998.
Bubble3D Draws a stream of rising, undulating 3D bubbles, rising toward the top of the screen, with transparency and specular reflections. Written by Richard Jones; 1998.	Bubbles This simulates the kind of bubble formation that happens when water boils:small bubbles appear, and as they get closer to each other, they combine to form larger bubbles, which eventually pop. Written by James Macnicol; 1996.
Bumps A spotlight roams across an embossed version of your desktop or other picture. Written by Shane Smit; 1999.	Cage This draws Escher's "Impossible Cage", a 3d analog of a moebius strip, and rotates it in three dimensions. Written by Marcelo Vianna; 1998.
Carousel Loads several random images, and displays them flying in a circular formation. The formation changes speed and direction randomly, and images periodically drop out to be replaced by new ones. Written by Jamie Zawinski; 2005.	C Curve Generates self-similar linear fractals, including the classic "C Curve". Written by Rick Campbell; 1999.
Celtic Repeatedly draws random Celtic cross-stitch patterns. Written by Max Froumentin; 2005.	Circuit Animates a number of 3D electronic components. Written by Ben Buxton; 2001.
CloudLife Generates cloud-like formations based on a variant of Conway's Life. The difference is that cells have a maximum age, after which they count as 3 for populating the next generation. This makes long-lived formations explode instead of just sitting there. Written by Don Marti; 2003.	Compass This draws a compass, with all elements spinning about randomly, for that "lost and nauseous" feeling. Written by Jamie Zawinski; 1999.
Coral Simulates coral growth, albeit somewhat slowly. Written by Frederick Roeber; 1997.	Crackberg Flies through height maps, optionally animating the creation and destruction of generated tiles; tiles `grow' into place. Written by Matus Telgarsky; 2005.
Critical Draws a system of self-organizing lines. It starts out as random squiggles, but after a few iterations, order begins to appear. Written by Martin Pool; 1999.	Crystal Moving polygons, similar to a kaleidescope (more like a kaleidescope than the one called `kaleid,' actually). Written by Jouk Jansen; 1998.
Cube 21 Animates a Rubik-like puzzle known as Cube 21 or Square-1. The rotations are chosen randomly. Written by Vasek Potocek; 2005.	Cubenetic Draws a pulsating set of overlapping boxes with ever-chaning blobby patterns undulating across their surfaces. It's sort of a cubist Lavalite. Written by Jamie Zawinski; 2002.
CubeStorm Draws a series of rotating 3D boxes that intersect each other and eventually fill space. Written by Jamie Zawinski; 2003.	CubicGrid Draws the view of an observer located inside a rotating 3D lattice of colored points. Written by Vasek Potocek; 2007.
CWaves This generates a languidly-scrolling vertical field of sinusoidal colors. Written by Jamie Zawinski; 2007.	Cynosure Random dropshadowed rectangles pop onto the screen in lockstep. Written by Ozymandias G. Desiderata, Jamie Zawinski, and Stephen Linhart; 1998.
DangerBall Draws a ball that periodically extrudes many random spikes. Ouch! Written by Jamie Zawinski; 2001.	DecayScreen This takes an image and makes it melt. You've no doubt seen this effect before, but no screensaver would really be complete without it. It works best if there's something colorful visible. Warning, if the effect continues after the screen saver is off, seek medical attention. Written by David Wald, Vivek Khera, Jamie Zawinski, and Vince Levey; 1993.
Deco Subdivides and colors rectangles randomly. It looks kind of like Brady-Bunch-era rec-room wall paneling. Written by Jamie Zawinski and Michael Bayne; 1997.	Deluxe Draws a pulsing sequence of transparent stars, circles, and lines. Written by Jamie Zawinski; 1999.
Demon A cellular automaton that starts with a random field, and organizes it into stripes and spirals. Written by David Bagley; 1999.	Discrete More "discrete map" systems, including new variants of Hopalong and Julia, and a few others. Written by Tim Auckland; 1998.
Distort Grabs an image of the screen, and then lets a transparent lens wander around the screen, magnifying whatever is underneath. Written by Jonas Munsin; 1998.	Drift Drifting recursive fractal cosmic flames. Written by Scott Draves; 1997.
Endgame Black slips out of three mating nets, but the fourth one holds him tight! A brilliant composition! Written by Blair Tennessy; 2002.	Engine Draws a simple model of an engine that floats around the screen. Written by Ben Buxton and Ed Beroset; 2001.
Epicycle This program draws the path traced out by a point on the edge of a circle. That circle rotates around a point on the rim of another circle, and so on, several times. These were the basis for the pre-heliocentric model of planetary motion. Written by James Youngman; 1998.	Eruption Exploding fireworks. Written by W.P. van Paassen; 2003.
Euler2d Simulates two dimensional Incompressible Inviscid Fluid Flow. Written by Stephen Montgomery-Smith; 2002.	Extrusion Draws various rotating extruded shapes that twist around, lengthen, and turn inside out. Written by Linas Vepstas, David Konerding, and Jamie Zawinski; 1999.
FadePlot Draws what looks like a waving ribbon following a sinusoidal path. Written by Bas van Gaalen and Charles Vidal; 1997.	Fiberlamp Draws a groovy rotating fiber optic lamp. Written by Tim Auckland; 2005.
Fireworkx Exploding fireworks. Written by Rony B Chandran; 2004.	Flag This draws a waving colored flag, that undulates its way around the screen. The trick is the flag can contain arbitrary text and images. By default, it displays either the current system name and OS type, or a picture of "Bob". Written by Charles Vidal and Jamie Zawinski; 1997.
Flame Iterative fractals. Written by Scott Draves; 1993.	FlipFlop Draws a grid of 3D colored tiles that change positions with each other. Written by Kevin Ogden and Sergio Gutierrez; 2003.
Flipscreen3d Grabs an image of the desktop, turns it into a GL texture map, and spins it around and deforms it in various ways. Written by Ben Buxton and Jamie Zawinski; 2001.	FlipText Draws successive pages of text. The lines flip in and out in a soothing 3D pattern. Written by Jamie Zawinski; 2005.
Flow Strange attractors formed of flows in a 3D differential equation phase space. Written by Tim Auckland; 1998.	FluidBalls Models the physics of bouncing balls, or of particles in a gas or fluid, depending on the settings. If "Shake Box" is selected, then every now and then, the box will be rotated, changing which direction is down (in order to keep the settled balls in motion.) Written by Peter Birtles and Jamie Zawinski; 2002.
Flurry This X11 port of the OSX screensaver of the same name draws a colourful star(fish)like flurry of particles. Original Mac version: http://homepage.mac.com/calumr Written by Calum Robinson and Tobias Sargeant; 2002.	Flying Toasters A fleet of 3d space-age jet-powered flying toasters (and toast!) Inspired by the ancient Berkeley Systems After Dark flying toasters. Written by Jamie Zawinski and Baconmonkey; 2003.
FontGlide Puts text on the screen using large characters that glide in from the edges, assemble, then disperse. Alternately, it can simply scroll whole sentences from right to left. Written by Jamie Zawinski; 2003.	Forest Fractal trees. Written by Peter Baumung; 1997.
FuzzyFlakes Falling colored snowflake/flower shapes. Written by Barry Dmytro; 2004.	Galaxy This draws spinning galaxies, which then collide and scatter their stars to the, uh, four winds or something. Written by Uli Siegmund, Harald Backert, and Hubert Feyrer; 1997.
Gears This draws sets of turning, interlocking gears, rotating in three dimensions. Written by Jamie Zawinski; 2007.	GFlux Draws a rippling waves on a rotating wireframe grid. Written by Josiah Pease; 2000.
GLBlur This program draws a box and a few line segments, and generates a radial blur outward from it. This creates flowing field effects. This is done by rendering the scene into a small texture, then repeatedly rendering increasingly-enlarged and increasingly-transparent versions of that texture onto the frame buffer. As such, it's quite graphics intensive: don't bother trying to run this if you don't have hardware-accelerated OpenGL texture support. It will hurt your machine bad. Written by Jamie Zawinski; 2002.	GLCells Cells growing, dividing and dying on your screen. Written by Matthias Toussaint; 2007.
Gleidescope A kaleidescope that operates on your desktop image, or on image files loaded from disk. Written by Andrew Dean; 2003.	GLForestFire Draws an animation of sprinkling fire-like 3D triangles in a landscape filled with trees. Written by Eric Lassauge; 2002.
GLHanoi Solves the Towers of Hanoi puzzle. Move N disks from one pole to another, one disk at a time, with no disk ever resting on a disk smaller than itself. Written by Dave Atkinson; 2005.	GLKnots Generates some twisting 3d knot patterns. Spins 'em around. Written by Jamie Zawinski; 2003.
GLMatrix Draws 3D dropping characters similar to what is seen in the title sequence of "The Matrix". See also "xmatrix" for a 2D rendering of the similar effect that appeared on the computer monitors actually *in* the movie. Written by Jamie Zawinski; 2003.	GLPlanet Draws a planet bouncing around in space. The built-in image is a map of the earth (extracted from `xearth'), but you can wrap any texture around the sphere, e.g., the planetary textures that come with `ssystem'. Written by David Konerding; 1998.
glschool Uses Craig Reynolds' Boids algorithm to simulate a school of fish. Looks best with more fish, so raise the number of fish until the frame rate declines to 25-30 fps. Written by David C. Lambert; 2006.	GLSlideshow Loads a random sequence of images and smoothly scans and zooms around in each, fading from pan to pan. Written by Jamie Zawinski and Mike Oliphant; 2003.
GlSnake Draws a simulation of the Rubik's Snake puzzle. Written by Jamie Wilkinson, Andrew Bennetts, and Peter Aylett; 2002.	GLText Displays a few lines of text spinning around in a solid 3D font. Written by Jamie Zawinski; 2001.
Goop This draws set of animating, transparent, amoeba-like blobs. The blobs change shape as they wander around the screen, and they are translucent, so you can see the lower blobs through the higher ones, and when one passes over another, their colors merge. I got the idea for this from a cool mouse pad I have, which achieves the same kind of effect in real life by having several layers of plastic with colored oil between them. Written by Jamie Zawinski; 1997.	Grav This program draws a simple orbital simulation. If you turn on trails, it looks kind of like a cloud-chamber photograph. Written by Greg Bowering; 1997.
Greynetic Draws random colored, stippled and transparent rectangles. Written by Jamie Zawinski; 1992.	Halftone Draws the gravity force in each point on the screen seen through a halftone dot pattern. The gravity force is calculated from a set of moving mass points. View it from a distance for best effect. Written by Peter Jaric; 2002.
Halo Draws trippy psychedelic circular patterns that hurt to look at. Written by Jamie Zawinski; 1993.	Helix Spirally string-art-ish patterns. Written by Jamie Zawinski; 1992.
Hopalong This draws lacy fractal patterns, based on iteration in the imaginary plane, from a 1986 Scientific American article. Written by Patrick Naughton; 1992.	Hyperball Hyperball is to hypercube as dodecahedron is to cube: this displays a 2D projection of the sequence of 3D objects which are the projections of the 4D analog to the dodecahedron. Technically, it is a "120 cell polytope". See also "polytopes" for a more general version of this using OpenGL. Written by Joe Keane; 2000.
Hypercube This displays 2D projections of the sequence of 3D objects which are the projections of the 4D analog to the cube: as a square is composed of four lines, each touching two others; and a cube is composed of six squares, each touching four others; a hypercube is composed of eight cubes, each touching six others. To make it easier to visualize the rotation, it uses a different color for the edges of each face. Don't think about it too long, or your brain will melt. See also "polytopes" for a more general version of this using OpenGL. Written by Joe Keane, Fritz Mueller, and Jamie Zawinski; 1992.	Hypertorus This program shows a rotating Clifford Torus: a torus lying on the "surface" of a 4D hypersphere. Inspired by Thomas Banchoff's book "Beyond the Third Dimension: Geometry, Computer Graphics, and Higher Dimensions", Scientific American Library, 1990. Written by Carsten Steger; 2003.
Hypnowheel Draws a series of overlapping, translucent spiral patterns. The tightness of their spirals fluctuates in and out. Written by Jamie Zawinski; 2008.	IFS This one draws spinning, colliding iterated-function-system images. Note that the "Detail" parameter is exponential. Number of points drawn is functions^detail. Written by Chris Le Sueur and Robby Griffin; 1997.
IMSmap This generates random cloud-like patterns. The idea is to take four points on the edge of the image, and assign each a random "elevation". Then find the point between them, and give it a value which is the average of the other four, plus some small random offset. Coloration is done based on elevation. Written by Juergen Nickelsen and Jamie Zawinski; 1992.	Interaggregate A surface is filled with a hundred medium to small sized circles. Each circle has a different size and direction, but moves at the same slow rate. Displays the instantaneous intersections of the circles as well as the aggregate intersections of the circles. Though actually it doesn't look like circles at all! Written by Casey Reas, William Ngan, Robert Hodgin, and Jamie Zawinski; 2004.
Interference Color field based on computing decaying sinusoidal waves. Written by Hannu Mallat; 1998.	Intermomentary A surface is filled with a hundred medium to small sized circles. Each circle has a different size and direction, but moves at the same slow rate. Displays the instantaneous intersections of the circles as well as the aggregate intersections of the circles. The circles begin with a radius of 1 pixel and slowly increase to some arbitrary size. Circles are drawn with small moving points along the perimeter. The intersections are rendered as glowing orbs. Glowing orbs are rendered only when a perimeter point moves past the intersection point. Written by Casey Reas, William Ngan, Robert Hodgin, and Jamie Zawinski; 2004.
JigglyPuff This does bad things with quasi-spherical objects. You have a tetrahedron with tesselated faces. The vertices on these faces have forces on them: one proportional to the distance from the surface of a sphere; and one proportional to the distance from the neighbors. They also have inertia. The resulting effect can range from a shape that does nothing, to a frenetic polygon storm. Somewhere in between there it usually manifests as a blob that jiggles in a kind of disturbing manner. Written by Keith Macleod; 2003.	Jigsaw This grabs a screen image, carves it up into a jigsaw puzzle, shuffles it, and then solves the puzzle. This works especially well when you feed it an external video signal instead of letting it grab the screen image (actually, I guess this is generally true...) When it is grabbing a video image, it is sometimes pretty hard to guess what the image is going to look like once the puzzle is solved. Written by Jamie Zawinski; 1998.
Juggle Draws a juggling stick-man. See also "Juggle3D". Written by Tim Auckland; 2002.	Juggler3D 3D simulation of a juggler performing with balls, clubs and rings. Written by Brian Apps; 2005.
Julia Animates the Julia set (a close relative of the Mandelbrot set). The small moving dot indicates the control point from which the rest of the image was generated. Written by Sean McCullough; 1997.	Kaleidescope A simple kaleidoscope. See also "gleidescope". Written by Ron Tapia; 1997.
Klein This draws a visualization of a Klein bottle or some other interesting parametric surfaces. Written by Andrey Mirtchovski; 2003.	Kumppa Spiraling, spinning, and very, very fast splashes of color rush toward the screen. Written by Teemu Suutari; 1998.
Lament Animates a simulation of Lemarchand's Box, the Lament Configuration, repeatedly solving itself. Warning: occasionally opens doors. Written by Jamie Zawinski; 1998.	Laser Moving radiating lines, that look vaguely like scanning laser beams. (Frankie say: relax.) Written by Pascal Pensa; 1997.
LavaLite Draws a 3D Simulation a Lava Lite(r): odd-shaped blobs of a mysterious substance are heated, slowly rise to the top of the bottle, and then drop back down as they cool. This program requires a fairly fast machine (both CPU and 3D performance.) "LAVA LITE(r) and the configuration of the LAVA(r) brand motion lamp are registered trademarks of Haggerty Enterprises, Inc. The configuration of the globe and base of the motion lamp are registered trademarks of Haggerty Enterprises, Inc. in the U.S.A. and in other countries around the world." Written by Jamie Zawinski; 2002.	LCDscrub This screen saver is not meant to look pretty, but rather, to repair burn-in on LCD monitors. Believe it or not, screen burn is not a thing of the past. It can happen to LCD screens pretty easily, even in this modern age. However, leaving the screen on and displaying high contrast images can often repair the damage. That's what this screen saver does. See also: http://docs.info.apple.com/article.html?artnum=88343 http://toastycode.com/blog/2008/02/05/lcd-scrub/ Inspired by the like-named program by Daniel Sandler. Written by Jamie Zawinski; 2008.
Lightning Crackling fractal lightning bolts. Written by Keith Romberg; 1997.	Lisa Lisajous loops. Written by Caleb Cullen; 1997.
Lissie This one draws the progress of circular shapes along a path. Written by Alexander Jolk; 1997.	LMorph This generates random spline-ish line drawings and morphs between them. Written by Sverre H. Huseby and Glenn T. Lines; 1995.
Lockward A translucent spinning, blinking thing. Sort of a cross between the wards in an old combination lock and those old backlit information displays that animated and changed color via polarized light. Written by Leo L. Schwab; August, 2007.	Loop Generates loop-shaped colonies that spawn, age, and eventually die. Written by David Bagley; 1999.
M6502 The m6502 screensaver emulates a 6502 microprocessor. The family of 6502 chips were used throughout the 70's and 80's in machines such as the Atari 2600, Commodore PET, VIC20 and C64, Apple ][, and the NES. Some example programs are included, and it can also read in an assembly file as input. Original JavaScript Version by Stian Soreng: http://www.6502asm.com/. Ported to XScreenSaver by Jeremy English. Written by Stian Soreng and Jeremy English; 2007.	Maze This generates random mazes (with various different algorithms), and then solves them. Backtracking and look-ahead paths are displayed in different colors. Written by Jim Randell and many others; 1992.
MemScroller This draws a dump of its own process memory scrolling across the screen in three windows at three different rates. Written by Jamie Zawinski; 2004.	Menger This draws the three-dimensional variant of the recursive Menger Gasket, a cube-based fractal object analagous to the Sierpinski Tetrahedron. Written by Jamie Zawinski; 2001.
MetaBalls Draws two dimensional metaballs: overlapping and merging balls with fuzzy edges. Written by W.P. van Paassen; 2003.	MirrorBlob Draws a wobbly blob that distorts the image behind it. Requires OpenGL hardware acceleration for nice animation. Written by Jon Dowdall; 2003.
Mismunch Munching errors! This is a creatively broken misimplementation of the classic munching squares graphics hack. Written by Steven Hazel; 2004.	Moebius This animates a 3D rendition M.C. Escher's "Moebius Strip II", an image of ants walking along the surface of a moebius strip. Written by Marcelo F. Vianna; 1997.
MoebiusGears Draws a closed, interlinked chain of rotating gears. The layout of the gears follows the path of a moebius strip. Written by Jamie Zawinski; 2007.	Moiré     When the lines on the screen     Make more lines in between,     That's a moiré! Written by Jamie Zawinski and Michael Bayne; 1997.
Moiré2 Generates fields of concentric circles or ovals, and combines the planes with various operations. The planes are moving independently of one another, causing the interference lines to spray. Written by Jamie Zawinski; 1998.	Molecule Draws several different representations of molecules. Some common molecules are built in, and it can also read PDB (Protein Data Base) files as input. Written by Jamie Zawinski; 2001.
Morph3D Platonic solids that turn inside out and get spikey. Written by Marcelo Vianna; 1997.	Mountain Generates random 3d plots that look vaguely mountainous. Written by Pascal Pensa; 1997.
Munch     DATAI 2     ADDB 1,2     ROTC 2,-22     XOR 1,2     JRST .-4 As reported by HAKMEM, in 1962, Jackson Wright wrote the above PDP-1 code. That code still lives on in this program, some 44 years later. The number of lines of enclosing code has increased substantially, however. Written by Jackson Wright and Tim Showalter; 1997.	NerveRot Draws different shapes composed of nervously vibrating squiggles, as if seen through a camera operated by a monkey on crack. Written by Dan Bornstein; 2000.
Noof Draws some rotatey patterns, using OpenGL. Written by Bill Torzewski; 2004.	Noseguy A little man with a big nose wanders around your screen saying things. Written by Dan Heller and Jamie Zawinski; 1992.
Pacman Simulates a game of Pac-Man on a randomly-created level. Written by Edwin de Jong; 2004.	Pedal This is sort of a combination spirograph/string-art. It generates a large, complex polygon, and renders it by filling using an even/odd winding rule. Written by Dale Moore; 1995.
Penetrate Simulates the classic arcade game Missile Command. Written by Adam Miller; 1999.	Penrose Draws quasiperiodic tilings; think of the implications on modern formica technology. In April 1997, Sir Roger Penrose, a British math professor who has worked with Stephen Hawking on such topics as relativity, black holes, and whether time has a beginning, filed a copyright-infringement lawsuit against the Kimberly-Clark Corporation, which Penrose said copied a pattern he created (a pattern demonstrating that "a nonrepeating pattern could exist in nature") for its Kleenex quilted toilet paper. Penrose said he doesn't like litigation but, "When it comes to the population of Great Britain being invited by a multinational to wipe their bottoms on what appears to be the work of a Knight of the Realm, then a last stand must be taken." As reported by News of the Weird #491, 4-jul-1997. Written by Timo Korvola; 1997.
Petri This simulates colonies of mold growing in a petri dish. Growing colored circles overlap and leave spiral interference in their wake. Written by Dan Bornstein; 1999.	Phosphor Draws a simulation of an old terminal, with large pixels and long-sustain phosphor. This program is also a fully-functional VT100 emulator! Written by Jamie Zawinski; 1999.
Piecewise This draws a bunch of moving circles which switch from visibility to invisibility at intersection points. Written by Geoffrey Irving; 2003.	Pinion Draws an interconnected set of gears moving across the screen. Written by Jamie Zawinski; 2004.
Pipes A growing plumbing system, with bolts and valves. Written by Marcelo Vianna; 1997.	Polyhedra Displays different 3D solids and some information about each. A new solid is chosen every few seconds. There are 75 uniform polyhedra, plus 5 infinite sets of prisms and antiprisms; including their duals brings the total to 160. Written by Dr. Zvi Har'El and Jamie Zawinski; 2004.
Polyominoes Repeatedly attempts to completely fill a rectangle with irregularly-shaped puzzle pieces. Written by Stephen Montgomery-Smith; 2002.	Regular 4D Polytopes This program shows one of the six regular 4D polytopes rotating in 4D. Inspired by H.S.M Coxeter's book "Regular Polytopes", 3rd Edition, Dover Publications, Inc., 1973, and Thomas Banchoff's book "Beyond the Third Dimension: Geometry, Computer Graphics, and Higher Dimensions", Scientific American Library, 1990. Written by Carsten Steger; 2003.
Pong The pong program simulates an ancient Pong home video game, as well as various artifacts from displaying it on a color TV set. In clock mode, the score keeps track of the current time. Written by Jeremy English and Trevor Blackwell; 2003.	popsquares This draws a pop-art-ish looking grid of pulsing colors. Written by Levi Burton; 2003.
Providence The providence code displays an eye, shrouded in glory, set upon the base of a pyramid. Written by Blair Tennessy; 2004.	Pulsar Draws some intersecting planes, making use of alpha blending, fog, textures, and mipmaps. Written by David Konerding; 1999.
Pyro Pyro draws exploding fireworks. Blah blah blah. Written by Jamie Zawinski; 1992.	Qix Bounces a series of line segments around the screen, and uses variations on this basic motion pattern to produce all sorts of different presentations: line segments, filled polygons, and overlapping translucent areas. Written by Jamie Zawinski; 1992.
Queens Solves the N-Queens problem (where, in this program, N is between 5 and 10 queens.) The problem is: how may one place N queens on an NxN chessboard such that no queen can attack a sister? Written by Blair Tennessy; 2002.	RD-Bomb Draws a grid of growing square-like shapes that, once they overtake each other, react in unpredictable ways. "RD" stands for reaction-diffusion. Written by Scott Draves.
Ripples This draws rippling interference patterns like splashing water. With the -water option, it manipulates your desktop image to look like something is dripping into it. Written by Tom Hammersley; 1999.	Rocks This draws an animation of flight through an asteroid field, with changes in rotation and direction. Written by Jamie Zawinski; 1992.
Rorschach This generates random inkblot patterns via a reflected random walk. Any deep-seated neurotic tendencies which this program reveals are your own problem. Written by Jamie Zawinski; 1992.	Rotor Draws a line segment moving along a complex spiraling curve. Written by Tom Lawrence; 1997.
RotZoomer Creates a collage of rotated and scaled portions of the screen. Written by Claudio Matsuoka; 2001.	Rubik Draws a Rubik's Cube that rotates in three dimensions and repeatedly shuffles and solves itself. Written by Marcelo Vianna; 1997.
Sballs Draws an animation of textured balls spinning like crazy. Written by Eric Lassauge; 2002.	ShadeBobs This draws smoothly-shaded oscillating oval patterns, that look something like vapor trails or neon tubes. Written by Shane Smit; 1999.
Sierpinski This draws the two-dimensional variant of the recursive Sierpinski triangle fractal. Written by Desmond Daignault; 1997.	Sierpinski3D This draws the three-dimensional variant of the recursive Sierpinski triangle fractal, using GL. Written by Tim Robinson and Jamie Zawinski; 1999.
SlideScreen This takes an image, divides it into a grid, and then randomly shuffles the squares around as if it was one of those annoying "16-puzzle" games, where there is a grid of squares, one of which is missing. I hate trying to solve those puzzles, but watching one permute itself is more amusing. Written by Jamie Zawinski; 1994.	Slip This program throws some random bits on the screen, then sucks them through a jet engine and spews them out the other side. To avoid turning the image completely to mush, every now and then it will it interject some splashes of color into the scene, or go into a spin cycle, or stretch the image like taffy. Written by Scott Draves and Jamie Zawinski; 1997.
Sonar This program draws a sonar screen that pings (get it?) the hosts on your local network, and plots their distance (response time) from you. The three rings represent ping times of approximately 2.5, 70 and 2,000 milliseconds respectively. Alternately, it can run a simulation that doesn't involve hosts. (If pinging doesn't work, you may need to make the executable be setuid.) Written by Stephen Martin and Jamie Zawinski; 1998.	SpeedMine Simulates speeding down a rocky mineshaft, or a funky dancing worm. Written by Conrad Parker; 2001.
Sphere Draws shaded spheres in multiple colors. Written by Tom Duff and Jamie Zawinski; 1982, 1997.	Spheremonics These closed objects are commonly called spherical harmonics, although they are only remotely related to the mathematical definition found in the solution to certain wave functions, most notable the eigenfunctions of angular momentum operators. Written by Paul Bourke and Jamie Zawinski; 2002.
Spiral Moving circular moiré patterns. Written by Peter Schmitzberger; 1997.	Spotlight Draws a spotlight scanning across a black screen, illuminating the underlying desktop (or a picture) when it passes. Written by Rick Schultz and Jamie Zawinski; 1999.
Sproingies Q-Bert meets Marble Madness! Written by Ed Mackey; 1997.	Squiral Draws a set of interacting, square-spiral-producing automata. The spirals grow outward until they hit something, then they go around it. Written by Jeff Epler; 1999.
Stairs Escher's infinite staircase. Written by Marcelo Vianna; 1998.	Starfish This generates a sequence of undulating, throbbing, star-like patterns which pulsate, rotate, and turn inside out. Another display mode uses these shapes to lay down a field of colors, which are then cycled. The motion is very organic. Written by Jamie Zawinski; 1997.
StarWars Draws a stream of text slowly scrolling into the distance at an angle, over a star field, like at the beginning of the movie of the same name. Written by Jamie Zawinski and Claudio Matauoka; 2001.	StonerView Chains of colorful squares dance around each other in complex spiral patterns. Inspired by SGI's `electropaint' screensaver. Written by Andrew Plotkin; 2001.
Strange This draws strange attractors: it's a colorful, unpredictably-animating field of dots that swoops and twists around. Written by Massimino Pascal; 1997.	Substrate Lines like crystals grow on a computational substrate. A simple perpendicular growth rule creates intricate city-like structures. Written by J. Tarbell and Mike Kershaw; 2004.
Superquadrics Morphing 3D shapes. Written by Ed Mackey; 1987, 1997.	Swirl Flowing, swirly patterns. Written by M. Dobie and R. Taylor; 1997.
T3D Draws a working analog clock composed of floating, throbbing bubbles. Written by Bernd Paysan; 1999.	Tangram Solves tangram puzzles. Written by Jeremy English; 2005.
Thornbird Displays a view of the "Bird in a Thornbush" fractal. Written by Tim Auckland; 2002.	Timetunnel Draws an animation similar to the opening and closing effects on the Dr. Who TV show. Written by Sean P. Brennan; 2005.
topBlock Creates a 3D world with dropping blocks that build up and up. Written by rednuht; 2006.	Triangle Generates random mountain ranges using iterative subdivision of triangles. Written by Tobias Gloth; 1997.
Truchet This draws line- and arc-based truchet patterns that tile the screen. Written by Adrian Likins; 1998.	Twang Divides the screen into a grid, and plucks them. Written by Dan Bornstein; 2002.
Vermiculate Draws squiggly worm-like paths. Written by Tyler Pierce; 2001.	VidWhacker This is a shell script that grabs a frame of video from the system's video input, and then uses some PBM filters (chosen at random) to manipulate and recombine the video frame in various ways (edge detection, subtracting the image from a rotated version of itself, etc.) Then it displays that image for a few seconds, and does it again. This works really well if you just feed broadcast television into it. Written by Jamie Zawinski; 1998.
Vines Generates a continuous sequence of small, curvy geometric patterns. Written by Tracy Camp and David Hansen; 1997.	Voronoi Draws a randomly-colored Voronoi tessellation, and periodically zooms in and adds new points. The existing points also wander around. There are a set of control points on the plane, each at the center of a colored cell. Every pixel within that cell is closer to that cell's control point than to any other control point. That is what determines the cell's shapes. Written by Jamie Zawinski; 2007.
Wander Draws a colorful random-walk, in various forms. Written by Rick Campbell; 1999.	WebCollage This program makes collages out of random images pulled off of the World Wide Web. It finds these images by doing random web searches, and then extracting images from the returned pages. It can also be set up to filter the images through the "VidWhacker" program. WARNING: THE INTERNET SOMETIMES CONTAINS PORNOGRAPHY. The Internet being what it is, absolutely anything might show up in the collage including -- quite possibly -- pornography, or even nudity. Please act accordingly. Written by Jamie Zawinski; 1999.
WhirlwindWarp Floating stars are acted upon by a mixture of simple 2D forcefields. The strength of each forcefield changes continuously, and it is also switched on and off at random. Written by Paul 'Joey' Clark; 2001.	WhirlyGig Draws zooming chains of sinusoidal spots. Written by Ashton Trey Belew; 2001.
Worm Draws multicolored worms that crawl around the screen. Written by Brad Taylor, Dave Lemke, Boris Putanec, and Henrik Theiling; 1991.	Wormhole Flying through a colored wormhole in space. Written by Jon Rafkind; 2004.
XAnalogTV XAnalogTV shows a detailed simulation of an old TV set showing various test patterns, with various picture artifacts like snow, bloom, distortion, ghosting, and hash noise. It also simulates the TV warming up. It will cycle through 12 channels, some with images you give it, and some with color bars or nothing but static. Written by Trevor Blackwell; 2003.	Xflame Draws a simulation of pulsing fire. It can also take an arbitrary image and set it on fire too. Written by Carsten Haitzler and many others; 1999.
Xjack This program behaves schizophrenically and makes a lot of typos. Written by Jamie Zawinski; 1997.	Xlyap This generates pretty fractal pictures via the Lyapunov exponent. Written by Ron Record; 1997.
XMatrix Draws dropping characters similar to what is seen on the computer monitors in "The Matrix". See also "glmatrix" for a 3D rendering of the similar effect that appeared in the title sequence of the movie. Written by Jamie Zawinski; 1999.	XRaySwarm Draws a few swarms of critters flying around the screen, with faded color trails behind them. Written by Chris Leger; 2000.
XSpiroGraph Simulates that pen-in-nested-plastic-gears toy from your childhood. Written by Rohit Singh; 2000.	Zoom Zooms in on a part of the screen and then moves around. With the "Lenses" option, the result is like looking through many overlapping lenses rather than just a simple zoom. Written by James Macnicol; 2001.