Christopher Chabris, co-author of "The Invisible Gorilla: And Other Ways Our Intuitions Deceive Us", spoke to Googlers in Mountain View on October 5, 2010. The Invisible Gorilla uses that ersatz primate as a departure point (and overarching metaphor) for exploring the myriad of other illusions, perceptual or otherwise, that we encounter in everyday life--and our often complete lack of awareness as we do so.