Posts Tagged ‘impossible triangle’

The Impossible Triangle

July 7, 2008

This is the Impossible Triangle, also known as the tribar or as the Penrose Triangle.  It was invented by Roger Penrose Oscar Reutersvärd in 1934, and even though he didn’t get his name attached to it, he did get a postage stamp in his honor.  

Even though this figure is impossible, it’s been constructed several times.  Sort of.  Brian MacKay and Ahmad Abas designed one for the Claisebrook roundabout in East Perth, Western Australia:

Photo by Greg O’Beirne, published under GNU Free Documentation License.

The triangle also appears at the Deutsches Technikmuseum in Berlin, Germany.

Photo by EmptyTerms, published under GNU Free Documentation License.

Of course, this is how it looks from another angle.

Photo by EmptyTerms, published under GNU Free Documentation License.

If you want to create your own, here is a one page printable pdf with instructions for a paper model, from Cool Optical Illusions.  

I’ll leave you with a final video showing yet another possible impossible version.

 

Edited (7/7) to add:  The video I really wanted to include was this one:

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