This extra dimension could be separated from ours by a million trillion trillionth of a centimeter. Is this a parallel yet inaccessible universe? It interacts with our dimensions only via gravity.

While the appearance of “The Upside Down” is fictional, science has supported the idea of ??alternate dimensions like in Stranger Things ...

Some portals take players to parallel universes ... A few years later, Insomniac would revisit this dimension-hopping mechanic briefly in Marvel's Spider-Man 2. After stealing a magical device ...