I do. I don't know why, and I'm pretty certain it's bad for the old eyes, but I love the way you see things a bit differently, and realising that your eyes can quite easily help your brain to play tricks on you. Well, if you want the ultimate eye-brain-mind-screw then head down to the Light Show at the Hayward Gallery. The exhibition is pretty fun and interactive but the highlight is the colour room at the end... I won't spoil it... there's more to it than standing in coloured rooms.
Actually there isn't really. But it's about what happens with the brain and the eyes when you move from one to another, and it's something magical which ended up with around half an hour walking round and round and round, until I felt I needed to leave in case my eyes fell from the front of my head.
Just go. It's ace.