ROBERT BROOK / SCIENCE PHOTO LIBRARY ROBERT BROOK / SCIENCE PHOTO LIBRARY
Model of a tesseract with glass panels creating internal reflections suggestive of multi-dimensional space. A tesseract is a 4-dimensional analogue of a cube, as a cube is a 3-dimensional analogue of a square. The model is a theoretical projection of a four dimensional cube onto three dimensional space, analogous to an image, drawing or shadow of a cube as a projection of a three dimensional cube onto a two dimensional space (plane, sheet of paper). The concept was first developed by a British mathematician, Charles Hinton in the late 19th century based on the work of Bernhard Riemann, a German mathematician, who first developed the theory of hyperspace.
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