It’s safe to climb and play on the roof of this house without a ladder. Leandro Erlich‘s Dalston House makes scaling the brick facade of the three-story walk-up easy, with mirrors doing most of the work. The real background is a relief motif on the ground plane, and its image is rendered upright through the large mirror that hangs at a perfect angle. Children and adults alike are welcome to interact with the installation and pose for pictures that capture only the effects of the optical illusion. But be careful — don’t let your camera betray the technical secret! More info here