[N0B0DY]

Following your logic, Prof, I think we would have to ask what would prevent a finite universe from expanding infinitely. If we propose a low-temperature boundary, then we are forced to reckon with the infinite pressure of the culminative effects of that low temperature. The mechanics don't make a bit of sense anyway; if we propose that nothing prevents the expansion, we are placing actual existence inside non-existence; and I don't think potential and infinite because potential implies a position whereby it would take an eternity to become infinite. There has to be an a priori infinity of which finite measurements can be extracted, and your picture analogy would explain that perfectly.

The fourth dimension of time/motion/gravity offsets the expansion of 3-d space. Any absolute point, or picture, is caused by photons (forward time) meeting gravitons (backward time). The difference in speed allows for incremental time, and allows for observable snapshots.