Hilda asteroids are in a 3:2 resonance of mean motion with Jupiter. This enables them to have aphelia up to the distance of Jupiter and not beeing scattered. They form a typical triangle.
Re: Exhibit B:
Install overhead camera. Hand out colored/marked paper hats to your patrons. You generate the actual data in real time.
Wait... could we use moshpits to generate cryptographically strong randomness?