Alan Watts said it about LSD - but equally applies to MDMA. Use it like a scientist uses a microscope. Use it to observe but then you go away and work on what you have experienced. Don't get fixated on the observation stage.
"Once you got the message, hang up the phone."
Dreamcatchers — rather indigenous culture broadly, at least in the US — also has a developed philosophy of oneness with nature. Again, when you see the insights psychedelics have to confer, it makes sense to go find the people who’ve been talking about those insights for millennia. Western thought is just an entirely different train. It’s all extremely valuable IMO but we have artifacts of western philosophies all around us every day. None of these are intended to remind us of The Big Ideas that one is likely to come across via psychedelics.
Colorful shirts: This is because you just appreciate certain patterns/colors more after seeing them on psychedelics. No clue how to describe this lasting impression but it is VERY real.
Pyramids/crystals: no clue but entirely possible they just fall into the same category as shirts for that individual (alongside things like kaleidoscopes).
[0] Note this is NOT some new age woo woo about quantum whatever. It’s the factual observation (made more obvious via meditation or psychedelics) that 100% of our experience of the world occurs via the “interpretation machine” that lives mostly inside our skull. Not one of us is making direct contact with “reality” as it exists beneath human interpretation.
Some people have a genuine academic curiosity about human belief systems and the nature of experience. It is similar to how a Anthropologist might have many artifacts in their home or a religious scholar would have different religious text.
It doesn't mean that do you believe in everything, as much as that means that you enjoy being curious and engaging with different ideas.