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.

Watch the triangle version in action below:

And here's the steel door with rod system: