If you can read this article without scratching yourself, more power to you. I couldn't, and actually had a range of sensations that were so overpowering as to require three days to read the whole thing: I took breaks for deep cleansing breaths.
But so worth it!
THE ITCH, by Atul Gawande
The New Yorker
Go read, and come back to discuss!
"visual perception is more than ninety per cent memory and less than ten per cent sensory nerve signals."