I believe it depends very much on dosage and the ability to let your mind go. If you're grasping at straws trying to keep reality in check, chances are that a lot of the energy that would be being put to use by your imagination will be diverted towards keeping that stranglehold on reality. In terms of dosage: on small amounts (~1g) it feels to me like a very strong cannabis high with some color enhancement; moderate doses (~1.5-2.5g) give me some slight patterning, fascination with reflection (puddles take on a life of their own, almost like a tv screen), warping and wavy effects, slight deconstruction of objects/faces (kind of like an abstract painting) where a face will be more like a compilation of lines and differently colored shapes that don't fit together quite right, and a general mood lift and confusion; higher doses (~3.5-4.5g) everything previously mentioned, plus everything seems to take on a life of it's own, couch fabric will resew and repattern itself, paint will begin to flow and paintings will come to life, everything will begin to breathe and flow and sometimes even try to communicate (the communal bathroom on my hall at my old college turned into an orchestra whilst empty; sinks, showers, and toilets were turning themselves on and off in perfect timing to create some beautiful music), things change in size and shape, confusion is immense; large doses (~5-7g) everything previously mentioned, but in addition, at least in my experience, it seems as though you can merge with other things around you: I felt what it was like to be a tree and saw how much my surroundings had changed in the hundreds of years I'd stood stationary, and I spent some time as the wind moving the clouds about to create new formations. It's also possible at this kind of dosage to have serious changes in perspective, especially when it comes to size, I've felt simultaneously taller than the trees but shorter than the grass, I also felt as though I was standing right next to the moon at one point, during another trip I saw the inside of my house as though I was 4 or 5 years old again, everything looked monstrous in comparison to how it usually looks.
Good luck with your future trips, just keep an open mind, let the shrooms take your mind where they want to, and don't be afraid to up your dosage (provided you're in a safe place to trip). Have fun!
