I'm playing around with the software with four simultaneous creatures and the feeling reminds me of when I first saw the creatures run a few years ago. I was dumbfounded, and I am again right now.

I set it up so that it refines motor coordination until there are four creatures which bound almost equally proficiently, and then a kind of earthquake happens and they all grow new tetrahedrons somewhere fairly low on their bodies. They then have to fairly compete with their new attributes until they once again refine to being almost equally proficient runners.

The shock is that you see them grow limbs to accomplish their task!