I've always heard that Special K is a dissociative, not a hallucinogen. This has been confirmed with my experience with it as well. It's the only drug I've every tried where I can float above myself and look down on my body, but I've never seen anything that really wasn't there, no matter how much I've taken.
". It's the only drug I've every tried where I can float above myself and look down on my body" would certainly be a hallucination.
Ketamine is both a dissociative (it makes you feel disconnected from your body) and a hallucinogen (it can cause visual patterns or images to appear that are not parsimonious with what you would normally see).
It becomes far more hallucinogenic (or psychedelic preferentially) when you "khole".
Not arguing the hallucinogen/dissociative labeling but wouldn't imagining the view from above your body count as seeing something that was generated entirely in your head? I mean...unless you were somehow actually floating above yourself which seems fairly unlikely (what with your eyes remaining in your head and all).
I don't know that it isn't a hallucinogen, but I've always heard that it's not.
Although, I wouldn't consider an out-of-body experience a hallucination, because it's not adding anything to the scene. I think it's more of a perspective shift, based on what you already know about yourself and your surroundings. I wonder if it could be experienced by someone who has (hypothetically) never looked at themselves in a mirror, or someone who is blindfolded and moved into a different setting that they were not previously familiar with.
I've experienced plenty of hallucinations, and the out-of-body experience from K was dramatically different for me. If felt more like a dream state, rather than a mostly normal state where my eyes were playing tricks on me (LSD and the like).