@Roy I just wanted to second this experience.
In my salvia experience back in 2015, a radical shift occured in my perception of Being.
I was observing a pretty idyllic college scene in my friend's dorm room. I was sitting on an oversized beanbag and all of my friends were sitting on the couch in front of me, joking, laughing and passing around a joint. While sober, there is depth to visual perception. I see my own hands and body in the foreground, I see some furniture like the floor and coffee table as the midground, and I see my friends on the couch with the wall behind them as the background.
After the hit of salvia, the foreground, midground, and background all became the same plane. So my visual perception transformed as if it were "reduced" onto a flat land, like it all collapsed onto a piece of paper or the canvas of a painting. The floor, coffeetable, couch that my friends were sitting on, and the wall behind them all meshed onto the canvas. Flattening occured not only of sight, but also sound and feeling. It all became plastered on a single plane. It was wildly cool, but here's the thing...I wasn't myself. I became the beanbag and the floor beneath me. My perception seemed to have collapsed downward from my body to the beanbag and the floor beneath it, and I was just residing in flatland. What's interesting is that there was a kind of "rolling of the parchment" occurring on the left side of my field of vision, like I was watching a 2D sidescrolling videogame; Flatland was being rendered (?) from the left side. To this day, I can't explain the strong directionality towards the left.
Anyways, my friend (whom I recognized as my friend...more on this in the next paragraph) then handed me, seemingly a bean bag, a pair of 3D glasses. I arose from being a beanbag to being a vague cloud of perception somewhat higher up in my clothes and belly. I stared at the 3D glasses laying in what appeared to be my hand. But I did not know what my hand was nor did I know what the glasses were. It seemed that inanimate object awareness disappeared for new objects introduced to flatland. I did not know the glasses were a separate "thing". I did not know what it meant to actively "thing." Are the glasses me? Is my hand me? Where does glasses start and hand end? I could not let go of the 3D glasses because I didn't know it was a "thing". So I stared at it in my open palm, unable to understand. Meanwhile, my friend was asking me to put them on, which was totally outside the scope of possibility.
Here's an interesting note. The perception that my friends are my friends and human beings are living things was still intact! Human life seems to have a living resonance that prevents it from being loosened up by this drug in the way that inanimate objects, sounds, and sensations got blended together and flattened. The same thing happened with my friend's cat - I knew that Princess was a living thing. I proceeded to stare at Princess as I shifted from being a beanbag to being a floating cloud of perception coalescing back into my body. I remember feeling like Princess was my peer...on the same level as me. I recognized Princess and Princess recognized me. A human being is no lesser or greater than a cat in the realm of living things.
Anyways, Salvia is batshit insane. It is by far the most mind-boggling psychedelic experience I've ever had, but I've predominantly done high-dosage shrooms and LSD. Salvia comes without warning and fires a sawed-off shotgun shell right into your perception...leaving some things intact and some things totally annihilated. I couldn't speak for the next hour, I didn't even want to. Piecing together the radical nature of what just happened gave me a new understanding of the comfortable structure of perception inside of which I reside as willful prisoner.
