Two brilliant, beautiful door designs by Klemens Torggler. Above is the Evolution; below is the Stahltür. They work on a similar principle.
I find the doors so beautiful that to some extent questions about practicality seem a bit irrelevant, but let’s deal with those first. One architect asked what design problem the doors solve. The answer is perhaps that they avoid the space-inefficient arc of a swing door on the one hand, and the functional and maintenance problems posed by sliding door tracks on the other. While they are perhaps not as space efficient as sliding doors embedded in a wall, it’s a fact that good sliding doors are costly and time-consuming to install after the fact. I’ve done it and it’s a pain; you have to remove a lot of drywall, turn the studs on edge, install (which can be finicky) and re-drywall. Whilte it’s true that you can install sliding doors on the face of a wall (ie. a “barn door”), that too requires tracks and/or hangers. The Torggler doors avoid all of that hardware and setup. I’m unclear how difficult these would be to install, not to mention fix once the hinges or articulating folds break down, they look as if they have few parts.
The doors are probably not particularly soundproof without the addition of a door frame. Also, with the Stahltür’s almost medieval clang you could hardly creep in or out of the bedroom quietly. It’s as if there might be a knight on the other side when you open it. Or a dragon, or a dungeon.
Another reaction was “hopeless for children,” but then before a certain age children can’t reach door handles either. And if we’d had this in the house when I was a kid I’d have been profoundly impressed.
Quite apart from the basic function question, I would say that aesthetic pleasure and wonder are an important function too. The beauty of this object at rest and in motion never gets boring. And how often is it that we see a familiar object like a door reconsidered in an entirely new way? This was a bit like seeing a Delorean open for the first time, but far more magical and arguably more practical.
The Evolution alternately reminds me of the slow wing flap of manta rays, Japanese origami, or actual magic.
I’d love to have both of these doors. My first thought was a wish my mathematician father were still alive to see them.
Friend and architectural photographer Krista Jahnke first told me about these.