A real-life implementation of the evergreen arcade game Tetris was obtained by optically trapping 42 glass microspheres (1 µm diameter) in a 25 µm x 20 µm sized field under a microscope. Their positions are then steered with a computer. The generation of multiple traps, as well as the computer-steering, is accomplished by the use of acousto-optic deflectors: devices that tune the deflection of a laser beam that have very fast response. This page contains real-time videos and images of a µ-Tetris game, played live from the computer keyboard.
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