It's funny, I've studied a lot of psychedelics (probably because it was an area of research for both my parents), and salvia divinorum is a really really stand out plant in it's trips, it seems to be a very "technically philosophical" plant. Trip reports always go into weird things like "I became a book on a shelf for 4,000 years, and now I know inanimate objects are conscious", there is also the area of panpsychism and animism.

That stuff is all a little too mind bending for me, but pretty fun thinking for a Sunday morning. :)