MC Escher's Impossible Waterfall Is Not Impossible

Watching a real life version of Escher's Impossible Waterfall melts my brain. The more I look at, the more confused I get! Thankfully, the secret on how the whole illusion works is out. There's clear DIY instructions on how to make your own impossible waterfall on Instructables and that video above shows what's really » 4/28/11 9:20pm 4/28/11 9:20pm