At first glance Igor Lobanov's Wormhole chair looks like an impossible object that could only exist as a computer physics simulation. But once you wrap your head around its zip-together design, it not only seems plausible, but also pretty genius.
Each chair is composed of two flat, but rounded, frame pieces that each fold into a C-shape and completely zip together. So they end up creating a self-supporting place to sit that looks like someone has torn a wormhole into another dimension. It won a much-deserved Red Dot design award, but is sadly still just a concept waiting for an unnamed yet popular Swedish maker of flat-pack furniture to license the design. [Igor Lobanov via Core77]