MIDWEST SUMMER NIGHT'S DREAM,1977
Bugjar has a single point of light moving through sixteen points around the circumference of a gallon jar. The direction of the sequence, and the number of steps taken in that direction are determined by a four-bit binary psuedo-random sequence generator. The point of light moves constantly back and forth with no apparent rhythm. In response to acoustic noise, the point of light sequences in it's current direction at a velocity directly proportional to the amplitude of the noise. If you tap on the glass or make a loud noise, the point of light spins around in one direction or the other. The louder the noise, the faster it will spin.
This machine was my introduction to iteration.