So, I did look for this previously, but I have today stumbled upon the chapter I quote below, Talking Rocks, from Notes from the Tilt-a-Whirl, on youtube, so here it is. 4 minutes. You can watch another chapter called Breathing Characters here. You can also view the special feature with ND Wilson of why he wrote this book and made this movie here.
Talking Rocks - Notes from the Tilt-a-Whirl
