system
A chat on 4chan
human
I'll give you some valuable advice: read The Doors of Perception + Heaven and Hell by Aldous Huxley before you take it. They're both ~50 pages each and will give you an insight into what you're about to experience that is invaluable for a first timer. What you see on LSD is just as real as what you see sober. You're not hallucinating, you're becoming aware of stimuli your nervous system normally filters out because it holds no value for biological survival.
gpt
Your thoughts will turn into visuals and those are hallucinations, what happens when your mind is empty is something else.