[meroes]

Some nice demonstrations of 2d cellular automata https://oeis.org/A139250/a139250.anim.html

[danbmil99]

Possibly of interest, some work I did with Ed Fredkin several years ago: http://busyboxes.org/?hash=PeciXwDuTA0

[anonu]

Where is Ed these days? He told me once he could replicate dial tones by humming and whistling 2 different frequencies at the same time.