I have all of these i took the raads-r got 195 but idkk man ive never taken anything except weed but i saw all this before that the visual snow the breathing walls but objects look like they are moving closer when i stare at them like (dressers, whole ass walls, doors)
I think that everyone can see these in theory, but different people focus on different types of information (eg low level sensory information vs high level sensory information) by default.
I believe drugs or meditating can change which types of information you pay more attention to by default, momentarily or even permanently.
I’ve never taken drugs beyond caffeine & alcohol, but meditating makes these phenomena much easier to see. I bet you could get most people to see them if you ask them to e.g. stare at a textured surface like carpet for 20 seconds and describe what they’re seeing.
Most people do not do this normally because why would you focus on these things for long periods of time unless your on drugs, meditate, or a bored kid?