@ PAQ It's not me!...
But in the past when I was a basic coder on Atari, very long time ago :) just draw with randomize the images' forms shown on the first post
The trick was to draw it at the good intersection's point! ;)
Like this one :) (it don't use the same trick :)
Bob http://stephencollins.net/penrose/
this one is made by me with the program Bob above! :)


This one is more powerful
An astonishing Penrose Program !
http://www.westmaster.com/zidek/research/