A skateboard for stairs! Inspired by the London urban landscape, the Stair Rover Stairboard is a longboard with dual-wheel stair-descending mechanisms in place of regular wheels. If your city has stairs, whole new travel routes instantly open up. From designer/inventor (product innovator, that is) PoChih Lai. For some broodingly moody urban architecture imagery, and a few quick shots of stairboard action, check the vid…