Think of it like its describing a space. X is a line. X^2 is a 2d grid. X^3 is a 3d cube. X^4 is a hypercube. You can make each x the length of an axis describing a space.
Now go backwards. X^4 describes a hypercube (tesseract). X^3 describes a cube. X^2 a plane. X^1 a line. So x^0? It must be a point. Or a single unit of space.
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