Do you have a source for that? And did you mean special relativity? In spacetime, time is different from space -- the metric tensor has opposite sign for time

Do you have a source for that? And did you mean special relativity? In spacetime, time is different from space -- the metric tensor has opposite sign for time dimension. https://www.quantamagazine.org/a-defense-of-the-reality-of-time-20170516/ https://www.quantamagazine.org/a-defense-of-the-reality-of-t... has a brief argument that you can rotate around in space because it has 3 dimensions, but time is only 1 dimension so you can't turn around. There are two directions but you can't pass between them.