One could say: "The boundary condition of the universe is that it has no boundary." The universe would be completely self-contained and not affected by anything outside itself. It would neither be created nor destroyed. It would just BE. — Anonymous Copy Share Image
“If we presume that the boundary of the universe is a kind of surrounding wall, then we think like ancestors who thought there's abyss at the edge of flat earth.” — Toba Beta Copy Share Image
