>> It's my understanding that Psilocybin and LSD do not produce hallucinations (e.g. seeing something which does not exist. I'm aware of the difficulty of quali

>> It's my understanding that Psilocybin and LSD do not produce hallucinations (e.g. seeing something which does not exist. I'm aware of the difficulty of qualifying the previous sentence) versus changing your perception of phenomena. If you sit in a completely dark room on LSD, you will see something other than a completely dark room. Do those things that you see exist? Maybe there's some technical definition of hallucination that isn't being met, but turning a complete lack of visual stimulus into something sounds like a hallucination to me. I was always aware at some level that what I was experiencing was due to the drugs I took, so maybe that has something to do with whether it was a hallucination or not?