in most cases, you don't see much of the world past you own eyes anymore, but some "fantasy", which is why it is aptly called an hallucinogen. It messes with your head and you have a hard time making sense of the world so you revert to some basic notions of knowledge, that appear like an epiphany because they are that basic. I don't think these are new found insights and good luck if these facilities of your brain are damaged in the process. It is called acid for a reason.

Edit: A neat analogy would be fuzzing a production system. Not only that, it is randomly deleting files and flipping bits of memory to see how robust the system is. If your system is error free, the fuzzing is not a problem, but every system has bugs.