Here are the graphical mapping of relativity on a hypercube timeline view and inner cube view.

The larger static square is the observer and the moving is the subject at increasing relative speed to C. The plane of the subject turns in relation to the observer changing time,length and mass.

The thing is only the observer actually think the mass has increased, the length shortened and the time has dilated. As the subject is just moving along on a shifted angled plane normally

When you understand graphing on a hyper-cube and that you then can do it on all 6 faces and they interact you basically get looking glass technology