In his lab at the University of Western Ontario in London, Ontario, he has a selection of circular blocks shaped like poker chips, which he likes to lay out on a table to create an optical illusion. The configuration must be precise&colon; he puts one chip inside a ring of chips that are much bigger than it is, and another, of identical diameter, inside a ring of much smaller chips. When asked to judge the relative sizes of the two central chips, people always say that the one surrounded by the smaller circles is larger than the other. But even though their conscious brains fall for the illusion every time, their bodies are not so easily fooled&colon; Goodale has videotaped evidence showing that when people reach out to grasp the chips, their hands open equally wide for either one.