The Penrose triangle, also known as the Penrose tribar, the impossible tribar, or the impossible triangle, is a triangular impossible object, an optical...

independently discovered and made popular by Lionel Penrose and his son Roger Penrose. A variation on the Penrose triangle, it is a two-dimensional depiction of a...

algebraist and geometer John A. Todd. He devised and popularised the Penrose triangle in the 1950s in collaboration with his father, describing it as "impossibility...

popularised by Lionel Penrose and his mathematician son Roger Penrose. A variation on the Penrose triangle, it is a two-dimensional depiction of a staircase in...

physicist; Sir Roger Penrose, born 1931, mathematical physicist and mathematician (with whom Lionel co-authored papers on the Penrose triangle); and who shared...

tensors Penrose stairs, impossible object (co-created with his father Lionel Penrose) Penrose tiling, an example of an aperiodic tiling Penrose triangle, impossible...

A Penrose tiling is an example of an aperiodic tiling. Here, a tiling is a covering of the plane by non-overlapping polygons or other shapes, and a tiling...

Geological Society of America Penrose tiling, an aperiodic tiling discovered by Roger Penrose Penrose triangle and Penrose stairs, optical illusions All...

two Penrose triangles. A Penrose triangle is an impossible object designed by Oscar Reutersvärd in 1934, and found independently by Roger Penrose in 1958...

Oliver Penrose FRS FRSE (born 6 June 1929) is a British theoretical physicist. He is the son of the scientist Lionel Penrose and brother of the mathematical...