i thought about string theory and how those strings because they are the largest 1d object in this universe are their own universes, and because they are all paralel with eachother this would mean that there are paralel universes of 1d objects, i thought this because if the universe is infinite then there must be something smaller than those strings because there cant be a start point because of infinite divisibility, and because of this there must be something larger than our universe, so the smallest thing in the 4d universe must be our universe. And this could mean that the strings of the 4d universe is our universe, so there must be parralel universes of our universe to be the exact same versions in the 4d universe as the 1d strings in our universe are.

Idk if this is science based, im no expert i just thought it was a cool idea. I also dont know much about string theory only that those strings are 1 dimensional and are the smallest things we can percieve.