> "seeing yellow auras" when he closed his eyes I want to demystify this a bit. I don't think it's as unusual as you suggest. I assume you haven't had any sub

> "seeing yellow auras" when he closed his eyes I want to demystify this a bit. I don't think it's as unusual as you suggest. I assume you haven't had any substances lately. What do you see when you close your eyes? If you're like I've always been, you see floaters, a few spots of light here and there, maybe a faint "ghost" of the image your eye had seconds before, especially if it was bright. I first noticed that in childhood. In childhood I also noticed that in low light, like in my parents' car in the evening, I would see this light occasionally. I read in some places that this is a possible explanation for when kids complain about seeing monsters in the closet, or similar. As I got older I noticed this sort of thing less. Later I started getting migraines, though, and when I get those symptoms I also see light that isn't there. Sometimes when I have a headache I can see it come in waves when I close my eyes. Later still, I got a little into meditation, and I noticed I could make those perceptions come about by manipulating my breathing. And finally, I did a low dose of psilocybin exactly one time in my life. I saw colors when closing my eyes. It was pretty much the same as all those experiences above, only a little more intense. But you know, we also see faces in clouds. Sometimes we think we spot recognizable objects, then look closer and longer, and they're not there. Our brains are taking shortcuts based on limited data all the time, without drugs. What the drug does, in my layperson's understanding, is make your brain very eager to make these connections. Just as you might see a face in a random, noisy pattern when you're not looking closely, your brain is eager to interpret whatever visual data it gets and run with it. When your brain is deprived of sensory input, such as in darkness or with eyes closed, seemingly it can do this more. I would say about your friend, don't rush to judge them for describing a particular wrinkle of how his brain works. Perhaps they got a little too into talking and thinking about it, or came to the wrong conclusion. But the experience itself is not that remarkable, and happens to sound-minded people all the time.