Science tells us the object you see here cannot exist in the real world. It’s an illusion. An Escherian ruse. Ulrich Schwanitz says, “Pfft.” Now, normally, when people say they’ve designed a 3-D ...

In the vast world of geometry and art, there are figures that challenge our perception and understanding of space. One of these figures is the Penrose Triangle, also known as the Tribar. This object, ...

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 effectively ...