Take 5 minutes or more to play with this system. What are your instincts as you begin to play? Do they change over time?
Subservient Chicken is an excellent example of emergent play. I'll update this post later with links to evidence of this emergent play, but for now-- just check it out.
(Oh, I can't help it: Here is some evidence of emergent play with the Subservient Chicken system: here, and here. Why do you think I'm calling this stuff emergent play? Also, there's lots more out there, find anything interesting?)