A CPU, a planar object, does so by extending its fins in the three-dimensional direction, but not without limit. Similarly, even if the fourth dimension can be

A CPU, a planar object, does so by extending its fins in the three-dimensional direction, but not without limit. Similarly, even if the fourth dimension can be used, it cannot be used without limit. Also, just as there are no two-dimensional objects without thickness in three-dimensional space, there are no three-dimensional objects without thickness in four-dimensional space, and all three-dimensional objects are considered to have size in the fourth-dimensional direction in four-dimensional space. However, if there is such a simple fourth spatial dimension, it should be easily recognizable, so if there is a fourth spatial dimension, it should be closely attached to other known dimensions so that it cannot be found. Finding or creating a usable space out of a closely attached fourth spatial dimension would be a large cost.