Over in East London, Argentine artist Leandro Erlich has devised this optical illusion installation that allows visitors to cartwheel across the façade of a Victorian house. The trick? Well, first, the house's exterior is actually on the ground, and the image you see is not the house at all, but rather an enormous mirror slanted at a 45-degree angle toward the floor. Dalston House is open (and free!) until August 4, so who's down to play Spiderman? [My Modern Met]