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.
Transcribed from http://www.youtube.com/watch?v=CAD25s53wmE
How do you define “illusion”? I think an illusion is a type of brain failure. An optical illusion is even more specific. Therefore, I think the term is wholly appropriate — and “brain failure”, while not at all inappropriate, is just unnecessarily vague.
Take off every 'quote'! You know what you doing. For great insight. Move 'quote'.
And if you don't: