An Escherian ruse. Ulrich Schwanitz says, “Pfft.” 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 ...

One of these figures is the Penrose Triangle, also known as the Tribar. This object, considered an “impossible figure”, is formed by three bars that appear to connect at right angles, forming a ...