I had a non-lucid dream that was oddly vivid.
I usually have extremely non-vivid dreams.
It's like I'm looking at everything through water, most of the time.
Anyway, my dream involved me opening and closing a closet, and at the last moment, when I last expected it, I opened it to see that through it was a sort of mirrored world identical to the one I was standing in, except I could walk in and out of it as if the closet was just a little archway.
Odd.