The word commonly used for this sort of thing is "ineffable" - that which cannot be put into words.
If you want to see a less "these are magical" and more "here's some science" perspective, you might like "How to Change Your Mind" by Michael Pollan. Always very down to earth, gets into some mechanics of effects, well written and engaging.
If you want to see a less "these are magical" and more "here's some science" perspective, you might like "How to Change Your Mind" by Michael Pollan. Always very down to earth, gets into some mechanics of effects, well written and engaging.