I think I recall reading about this concept in a magazine article written by Teller. He was describing a trick performed on a talk show (maybe Letterman?) that included releasing cockroaches. He described all the research and testing they did to find a type of cockroach that would move at the correct speed (not too fast or too slow). I think about this when I read about how tricks are done. Like when a girl is instantly teleported from a box on the stage to the upper balcony of a theater. It just never occurs to the average person that the magician would go through the trouble of hiring and paying twin (or even triplet) girls just to pull off that one trick in an act.