People in the three-dimensional space world seem to have found the existence of four-dimensional space-existence may be perceived. People's knowledge grows in three-dimensional space. It may be difficult to explore high dimensions under the existing conditions. For example, a bug that can only know two-dimensional space crawls in a square box. In this three-dimensional box with limited space, you can never climb to the end. For it, this is an infinite two-dimensional space.
People like us in three dimensions now. When you are in four dimensions, you can't change the limited perception of three dimensions. Where is the four-dimensional space? Our universe should be! (proposed by physicists).
Einstein's theory of relativity explains the universe: before the Big Bang, the chaotic state was a point in zero dimension. The energy released by the Big Bang led to the birth of various substances, which were reflected in various dimensions in turn. The so-called four-dimensional space is the three-dimensional space we face in life and time. Time and space are inseparable and are different parts of a unified whole. Because we are moving at a macro low speed on the earth, we can't perceive the deviation of phenomena in time, so we won't obviously feel the existence of four-dimensional space. If we can look around at a high speed close to the speed of light, then we can see that the ball enters the basket first, and then the player shoots.