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2D is a plane. 3D is space. So shouldn't a fourth dimension be something else? Is there really such a thing as fourth dimensional space. There is no such thing as a 3 dimensional plane. Though you can have a 2D plane in 3D space.

Next question leads to this. Why can't the fourth dimension be time itself. Could the four fundamental forces be themselves dimensions. These questions may be pretty dumb. Some helpful links could go a long way. Thanks!