fourth dimension

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  1. Surfaces in higher dimensions

    Rotation in four-dimensional space. https://youtu.be/vN9T8CHrGo8 The 5-cell is an analog of the tetrahedron. https://youtu.be/z_KnvGGwpAo Tesseract is a four-dimensional hypercube - an analog of a cube. https://youtu.be/HsecXtfd_xs The 16-cell is an analog of the octahedron. https://youtu.be/1-oj34hmO1Q The 24-cell is one of the regular polytope. https://youtu.be/w3-TqPXKlVk The hypersphere is an analog of the sphere.