well, it happened a few times when i was tripping my balls off... (no, i never actually visually hallucinated with my eyes open. it was more mental reprogramming, bliss-like body vibes, and heightened senses for the most part, [didn't take enough to leave this dimension.] but i digress.) so once on mushrooms, i got really entranced in the clouds. they were so peaceful. after staring at them for a few minutes they started to form into distinct patterns. that happened again on acid. i think the clouds were responding to the state of my consciousness.
the last time i ever took acid, i was in my front yard just kind of existing. two of my cats were following me around. then i stood still for a minute, centering myself or something. no lie, the cats started moving around me in a perfect circle in opposite directions. they did it a few times, and i laughed. i love symmetry. they just paused in front of me and i pet them. that was a very off-topic day, as i put it.
anyway, this kind of stuff seems to happen all the time. i'm sober now and it still happens. i'll have a disturbing thought and my truck's cd player will skip (no bumps) or i'll worry about it and it will skip. i'll be sitting using my laptop on my bed and i'll realize something slightly shocking and the cat will twitch even though i was completely still. qi seems like this mysterious thing, but it's usually quite simple.