3D universe as perception

we have of course assumed the basis and made a reconstruction of the observed reality in our minds, hence in our writings and so on.

Why solar system is flat?, because of inertia, and object keeps on the same direction, and all planets are almost all in the plane, but if the space was curved(i.e. measured w.r.t. another frame of reference of orthogonal axes as construct in our minds), then object will appear to go curved, but is going with inertia in that warped space.

So what ultimately matters is the relation of matter with other matter and the way the universe flows (or perhaps it is just how the brain could look at the world in today’s view)