

That doesn’t sound like acid. On psychedelics you see bright colors and fractal shapes.
I’ve stopped taking acid for this reason. You can never guarantee what’s on the tab and whether it’s safe. If you can get locally grown magic mushrooms that’s way better.

Just a small addition if you don’t mind—we don’t know whether the universe is finite or infinite. Intuitively, I prefer a finite universe because I can’t wrap my head around actual infinities.
Locally flat or curved regions are possible in both cases.