The 4-dimensional analogy of a 3D cube.
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That cannot be described as it is a 4D object. It can only be defined mathematically.
Number of sides of a hypercube depends on the level. A point is a hypercube of dimension zero. If one moves this point one unit length, it will sweep out a line segment, which is a unit hypercube of dimension one. If one moves this line segment its length in a perpendicular direction from itself; it sweeps out a two-dimensional square. If one moves the square one unit length in the direction perpendicular to the plane it lies on, it will generate a three-dimensional cube. This can be generalized to any number of dimensions. For example, if one moves the cube one unit length into the fourth dimension, it generates a 4-dimensional unit hypercube (a unit tesseract). You can research polytopes for many examples.
The 4th dimension is commonly regarded as time. So a 4D cube could be considered a 3D cube as it exists over time.
i think it is where 2d is flat 3d looks like you can touch it but you cant and 4d is where you can see it and physically touch it
It is a linear equation in one unknown, d.