May I have a copy of the tensors video please, Peetee? Ummm, it's got something to do with mapping vectors, transformations and distortions onto an n-dimensional manifold, I think, but I'd like to see the pictures.
By far the worst thing in this world is the lack of inclination or insight to ask questions rather than the not knowing the answers; and you'll never get the right answers until you've landed on the right questions
Having said that, here's my thoughts:
So what might a four dimensional object look like in 3D space? Well, it will look like a 3D object.
And what will the 4D line look like in 3D space? Wherever you look you'll be looking at the intersection of the 4D line and you, but you may not be able to see it.
And what will a process that oscillates in the fourth dimension look like? It may stand still in 3D space but it will get bigger and smaller.
When 4D spacetime was conceived, all dimensions were considered infinite. Uncle Albert felt uneasy about this and assigned the quantity R to the space dimensions, meaning an unknown but finite extent. I'm not sure about 'time' but I suspect it is a compactified dimension with an angular velocity which decreases as velocity increases.
How does everyone feel about this?