I can't stop watching this door open & close

Add this to the list of things we never knew existed but now desperately need: The Evolution Door, a "flip-panel" invention by Austrian designer Klemens Torggler.

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This is not Torggler's only alternative-door solution; his website actually lists several models. They're all based on rotating squares, but some systems incorporate rods, while others make use of a wheel, and a track arranged in an epitrochoid curve. The Evolution Door works by virtue of four strategically attached triangles that separate, fold and rotate with a gentle flick of the wrist. It's a wonderful play on geometry that makes it possible to move the screen from side to side without the use of a track, a topological trick that Torggler says "opens up new applications for the door." Personally, I'm having a hard time deciding whether Torggler's systems are actually practical or just eye-catching, but to be honest I'm not sure I care; these things are just an utter joy to witness in action:

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I will say that some of Torggler's rod-based systems (above) look to fall into that category of contraption that's fun to use right up until it lops off a few unfortunately placed fingers, at which point the novelty wears off rather quickly. To his credit, Torggler has addressed this concern in the triangular-paneled system of the Evolution Door:

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It looks like it might still be a tad uncomfortable, but it'll still save you a ziploc full of ice and a trip to the ER.

[Klemens Torggler via Rhett Alain]

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DISCUSSION

Speaking as someone who works in the door industry I can honestly say these are insanely impractical on all levels. (I build custom fire-rated doors for the marine industry. Mostly working vessels, but some military and cruise ships. Some interior, some weather tight, some water tight. We've also made Military security doors and blast doors.)

These seem like a kinda cool idea for a window shade, but not much else. Maybe you'll see them in some trendy shops over the dressing rooms, or maybe in a trendy bar over the bathroom.