I think this is hard to visualize with words like “out” being used, because then there must be an “in”, and if you draw everything back “in” you get a Centerpoint, no matter what.
Same with the baloon, because when plated, its going in all directions except for “in”, and in space, objects are zooming past each other, “in” and “out” yet still as expansion movement. (Right? I only kind of understand what you’re explaining while guessing at why it’s not 100% understandable for me.
In fact, anything that expands with a surface is going to be hard to visualize as how space moves because it all has a point it starts from.