From Business Insider:
Austrian artist Klemens Torggler has reinvented the door with his latest project.
Called the Evolution Door (which we first spotted on the blog Colossal), the 4-panel door opens and closes elegantly as though it's made of pieces of paper. Roggler calls it a "flip panel door" (or "Dryehplattentür").
Torggler has a few variations on this door, one with the origami-esque triangles that fold out to help the door move, and another system with rods that rotate two square panels.
Currently the door is a prototype, and comes in a glass, steel, and wood version.
The door's really cool; but the floor sure sounds creaky!
Click the link to check out the other door.
Hat tip: Beth Johnson