Penrose triangle is called "the most pure form of impossibility". It integrates the vertex angles of three triangles from different angles into a whole. Therefore, the plane that should be a plane has been twisted, and such a triangle cannot exist in the three-dimensional world.

Although Penrose triangle is an impossible object, it does exist a three-dimensional object. If viewed from a specific angle, the pattern it sees is the same as the two-dimensional pattern of Penrose triangle. Penrose triangle can refer to the impossible object itself or its two-dimensional pattern.

Source: @emmettclarketattoos