By the way, the shape of the universe has not yet been discovered by cosmology. There is a big question mark here.
Incidentally, there is such a theory in philosophy... I won't say the name because I might be wrong. But the essence is that there is no elementary, indivisible particle, just as there is no maximum large cluster of bodies. That is, the universe is not the limit; there is an incredible number of such substances (if I may express it that way) that, instead, create something even larger. And so on – infinitely... :)
Bow down and hear our cry,
Our earthly rulers falter,
Our people drift and die,
The walls of gold entomb us,
The swords of scorn divide,
Take not thy thunder from us,
Take away our pride.
G.K. Chesterton: English Hymnal