if you could really imagine something being different, like actually see if differently, like a full-blown hallucination — if you really saw it after just thinking about seeing it, like wondering, "can I imagine those two colors switching places?" and then your brain answered "yes", and switched the colors in it's "mind's eye" perception.. that could be really scary, like "holy crap.. can I make it go back? did other stuff change just now and I didn't notice it? do I now think that males and females, and I just don't realize it, and from now on people are going to think I'm using the wrong word, and I won't for the life of me be able to tell why?" — I feel like it would be good to be able to imagine things that well, though I'd like to be able to control it and understand it, rather than accidentally wreaking havoc..