the weightless feeling is your inner ear, your sense of gravity, either being ignored or repressed. On really high doses it's totally supressed and you gotta learn what muscles in your calves, quads, and back need to be contracted or relaxed to be able to stand straight. It's a fun trip to learn how to walk all over again. Close your eyes and you feel floaty. This is because your sense of spatial awareness ie where your body parts are located, still works. But because your sense of gravity is gone, so you don't know which direction is up or down. It feels like you float up and down because your eyes are registering up and down movement with every step, although you may not realize that's what is making you feel floaty, because your sense of sight automatically filters this motion out of your visual feed: your vision is steady (until you up the dose).
This is largely the reason why many dexxers go into "outer space" when they trip. If you close your eyes, you have no idea where you are. On higher doses, you can't even feel your body. This makes it feel like the black space behind your eyes is your whole world. If you're a visual thinker, then when you think about something, you can see it super clearly. You can essentially have the most powerful daydreams possible.
I'm a very verbal, wordful thinker. So I don't often have those weird trips to different worlds and stuff lots of dexxers get. I have one example.. On a heavy dose above 10 mg/kg (possibly was 12 mg/kg), I closed my eyes, and had no thoughts. I didn't feel my body, my breath, the air or gravity... I forgot to think, so my existence was just darkness for a long time. I opened my eyes, and saw all white. I focused closer, and saw speckling and texture in the white...I struggled for meaning. What was all this whiteness and texture?
Eventually I pulled a distant concept out of my scattered mind'; "Wall.". That's all I could see. It was all wall. With my binocular vision disabled, I had no depth perception, nor did I have any running concepts of distances and relative space. It seemed that all there was was simply wall.
I assumed, then, that if there was only wall, then I, too, was wall. I stared at the whiteness for a long time. I was on the comedown then, so I was gradually gaining back reason and memories and the ability to hold ideas. Eventually I realized that walls are connected to a floor and a roof, and I felt that my "existence" or "conciousness" was square, and boxed by heaviness on all four sides. Memories dripped back to me. I knew there was an end table set against this wall, and I felt it and was aware of its prescence against me. I knew there was a bed set against the wall, and I became aware of that, too. Eventually I realized that *I* was pressed against the wall, and got up and spent probably 20 minutes struggling to use the computer, but my vision was flanging... It's like a movie cinema that's off track; the picture flashes, and "slides" and "vibrates", usually downward and to the left. I think my right eye is dominant, but it could be some function in the brain that causes this consisent motion. Anyways, makes it near impossible to read, especially with like only 1 second of short term memory.
er.. yeah. Well, I said I was hella wordy, didn't I?