The purpose of the looking at the future...is to disturb the present!

Gaston Berger (1896-1960), francuski futurolog

Einstein Showed That Time Is Relative. But … Why Is It?

The mind-bending concept of time dilation results from a seemingly harmless assumption—that the speed of light is the same for all observers.
Link :
https://www.wired.com/story/why-time-is-relative/