Watch the video: Optical illusion: That’s why the “impossible triangle” is possible.
Three bars that are at right angles to each other and yet are connected to form a triangle. This actually violates several laws of geometry. According to Euclidean geometry, the sum of the interior angles of a triangle is always 180°. This 3D graphic shows a triangle which, as a physical object, would add up to an angle sum of 270°. That’s why it’s called an “impossible figure.” It’s called the Penrose triangle or tribar. The most famous representation of the impossible triangle comes from the British mathematician Roger Penrose, which was created around 1954. Because our brain is used to the two-dimensional images interpreting the retina of our eyes as a sensory impression of the three-dimensional world, this can lead to this illusion of perception.The skilful connection of three angles, which appear to be at an angle of ninety degrees and which are nevertheless combined to form a triangle, only works as a representation in The design conveys a three-dimensionality that does not exist and would not be physically possible.