What Exactly is a Tesseract? (Hint: Not a Superhero Stone)

A tesseract is a 4D cube, i.e. a cube that exists in 4 dimensions. Although fans of the Marvel universe and superheroes may associate tesseract with the glowing blue box that houses the Space stone, a tesseract is a real geometrical concept that exists in four dimensions.

Here is a simple way to conceptualize dimensions: a square is a 2D shape, so each of its corners has 2 lines coming off it at 90 degrees to each other. A cube is three-dimensional, so each of its corners has 3 lines coming off it. Similarly, a tesseract is a 4D shape, so every corner has 4 lines coming off it.
Mathematically speaking, a tesseract is a perfectly accurate and plausible shape, as are all shapes in higher dimensions, such as 5D and 6D. Just as a cube can be unfolded into 6 squares in 2D space, a tesseract can be unfolded into 8 cubes in 3D space.


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