BBC News - The science of optical illusions If you read throught the whole page its actually, um, eye opening. When I think about it, its a wonder why I hadn't quite understood why its so easy to fool our perception of things.
very intresting, too lazy to read all of it but what i read is a very intresting read now i know, and knowing is half the battle
More interesting is our brains interpret the rest of what we don't physically see. Then it "fills in the gaps".