This is great, thanks! This is the first time I hear it explained like this and it just somehow clicked immediately. I now have this (probably wildly incorrect

This is great, thanks! This is the first time I hear it explained like this and it just somehow clicked immediately. I now have this (probably wildly incorrect, total layman here) vision of the time dimension of velocity being "a normal" simultaneously to all the spatial dimensions and acceleration as rotation of the four-vector away from the time axis... sorry for any terminology errors.