I've tried DMT in the pitch black once (during a blackout!) and it was indeed the case that eyes open or closed, I was seeing the same exact things. It was an interesting (and creepy) experience. I could hear entities with their rhythmic telepathy all abound. Definitely not my favorite way to smoke spice, but not against trying it again some time.
"Science without religion is lame. Religion without science is blind" - Albert Einstein
"The Mighty One appears, the horizon shines. Atum appears on the smell of his censing, the Sunshine- god has risen in the sky, the Mansion of the pyramidion is in joy and all its inmates are assembled, a voice calls out within the shrine, shouting reverberates around the Netherworld." - Egyptian Book of the Dead
"Man fears time, but time fears the Pyramids" - 9th century Arab proverb