its hard to explain if you've never had them before
you're in a mentally altered sense of reality and it can be different for everyone because everyone's mind is different

for me the world just seems to sparkle and the only things that exist are whats in front of me. I LOVE taking shrooms and going to a giant park because the world just seems so happy, nice, joyful, and wonderful when its just me and nature when im on shrooms. the sun is warm and light and the trees and streams sparkle and everything is beautiful. I try to routinely take shrooms every month of so to clear out the gunk in my head that happens from all of the stress and bad things happening in my personal life from time to time and in the world all the time. it reminds me that yea there's bad out there but I gotta remember the good right here. and its also good for working thru trauma since I can kinda step back from the pain