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My first thought is that the drug is showing you what was in your mind to begin with.

"I first explored mescaline in the late '50s, three-hundred-fifty to 400 milligrams. I learned there was a great deal inside me" -- Alexander Shulgin

I happen to believe that they connect you to much more than just your mind, however.

That assumes your mind is disconnected from everything you define as not your mind, to begin with.