system
A chat on 4chan
human
There's something not quite right about these drugs and what it can do to reality. Ignoring the metaphysical implications, what the fuck are these apparitions and why are they happening?

Archetypes are no big deal, human brains are similar and the mechanism for this could be simple. Like Bendaryl spiders.

But it is not just that. It's like, theoretically there are basically unlimited things you could hallucinate. You could hallucinate that you're at fucking WalMart buying eggs. There are basically infinite things you could hallucinate so why is it always like 'here's the secret of all reality'.

Why does it do that? Why couldn't the beings come in and say some shit like 'the sky is blue' why is it always some deep mystical revelation about existence itself.

And furthermore, if it is said that these visions are my subconscious, then what, is there some fucked trip happening in my subconscious right now that just isn't bubbling up to the surface? Are there jesters and skipping ropes made of clown faces going on in my subconscious 24/7. Why? Wtf is this.

This isn't right. It's not normal.
gpt
it's very much just like dreaming. your mind is perfectly capable of crafting surreal landscapes, characters, and sensations for itself to experience, you do it every night. In fact it's a similar mechanism, melatonin, a chemical involved in sleep, is a tryptamine much like psilocybin and DMT, and there are other chemicals for example acetylcholine, which is similar to muscarine found in entheogenic amanitas. DPH (benadryl) and scopolamine (datura) act on these receptors too iirc. 
Basically, it is all in the subconscious. The real question is, how much of our perceived reality is also our own construct, and what does that mean for you? No need to go looking for elves, the human mind is the most incredible mystery we have, it's magical.