Now, normally, when people say they’ve designed a 3-D Penrose triangle, all they’re really saying is that it looks, from some perspectives, like the 2-D representation of the triangle.

Here's what the Swedish artist Oscar Reutersvard did. In 1934, he got himself a pen and paper and drew four cubes, like this. He called this final version "Impossible Triangle of Opus 1 No. 293aa ...

Dubbed "Penrose," for the noted mathematician and physicist Roger Penrose—who is known for concepts like twistor theory—the system goes beyond the capabilities of a graphing calculator.

The optical illusion of the impossible triangle in Perth, Australia. Seen from the right angle, this sculpture looks like a Penrose triangle. Credit: Bjørn Christian Tørrissen / Wikimedia Commons ...

Obviously, it’s an illusion: the Penrose Triangle monument only looks like the impossible object it \[…\] Skip to main content. SECURITY. POLITICS. THE BIG STORY. BUSINESS. SCIENCE.

The Penrose Triangle is as elegant as it is impossible—much like M.C. Escher’s drawings, it presents a two-dimensional illusion that the eye interprets as three-dimensional. The task of ...