Visually things were shimmering, rotating, morphing, changing colors, changing shapes, etc, etc. San Pedro is this big cactus that grows all over the place in Southern Ecuador. You cut it up into pieces and boil it for like 18 hours, while frequently squeezing out the liquid in the cactus. Eventually you're left with a thin green liquid. It really is disgusting.
Most people drink a bit then puke it back up.
What's really amazing is that even though the mind is experiencing things in some completely alien way, it all gets recorded so you remember the feeling. Yesterday I has a San Pedro cactus experience, and I'd just like to type up a quick post for those of you who are wondering about trying San Pedro. A friend of mine ordered 50 dried grams of San Pedro cactus from JLF poisonous non-consumables. He boiled it in 6 cups of water for about 3 hours, and when the liquid was brown, murky and extremely bitter-soap tasting, he stopped. He strained out the cactus solids, and divided the remaining liquid into two glasses, and cooled it in the frige untill it was drinkable.