By now many of you have seen that weird split door design that opens like this:
The original is called the EvolutionDoor, which we wrote about here. It was invented by Austrian artist Klemens Torggler, and we rarely see it credited to him.
People have made variants of it, like this one:
After seeing that video, Germany-based fabricator Phil Vandelay figured out how to build his own. Here's how he did it:
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