When you realize that everything "we" see is common hallucination, then it will all make sense. The human mind creates the image of a tree, the eye just takes in the light. Change the eye or the mind and our hallucination changes.

So these mushrooms change the mind in a very specific way, but no more strange than putting on red tinted glasses.

Speaking as someone who has involuntary hallucinations, this is a reality taken for granted by most people. I have very different hallucinations when I am dep[ressed vs when I am manic. And you are on the right track in my opinion that "the drug induces the same reaction in a human body, no matter its location."