Wordless Wednesday: No you have not accidentally swallowed magic mushrooms
This is one of my favorite exhibits in the San Francisco Exploratorium. It's a door (you can see the door handle in the lower right-hand corner) painted with a moving illusion pattern (This one is "Rotating Snakes" by Akiyoshi Kitaoka). It's really the most bizarre thing; you have to move forward and squash your nose against the door (or computer monitor, for those of you reading this post) to make sure it's not really moving. I'd love to put this on our front door this Halloween to freak people out!