I absolutely found that interesting, Peter! Thanks for sharing!

Now I’m curious whether time is orthogonal (a.k.a., perpendicular) to the spatial dimensions or not. I mean, in 3-D space you can move along the X axis without also simultaneously moving along the Y and Z axis. That’s because X, Y, and Z are orthogonal to each other. So I think the question is whether in four dimensional spacetime, in which we add a fourth axis T for time, that new axis is orthogonal or not to X, Y, and Z. If it is, then at least in principle, one should be able to move along the time axis without also moving through space.