Well, I'm not a downvoter, but I would disagree with the idea that this is related to the OP. OP is looking at mathematical properties of informational structure of brain scans, whereas this is just describing what people see when they trip. There's no reason the geometry of what you hallucinate should be related to the geometry of cortical activity while you see it.
I don't take downvotes personally. I've learned to accept them as meaningless gestures that make people feel powerful and in control, when infact no-one is really in control here. We're all acting :)