We’ve all bought and enjoyed books called ‘Optical Illusions’. We all love optical illusions. But that’s not what they should call the book. They should call them ‘Brain Failures’. Because that what it is: a complete failure of human perception. All it takes is a few clever sketches and our brains can’t figure it out.
Neil deGrasse Tyson
Transcribed from http://www.youtube.com/watch?v=CAD25s53wmE
Xkcd’s Randall Munroe once counted to zero, from both positive, and negative infinity which was no mean feat. Not to be outdone, Eliezer Yudkowsky counted the real numbers between zero and one.