An ancient memory
This layer upon layer problem reminds me of when I was a kid, and dad was redecorating a room in our Victorian semi. There were multiple layers of wallpaper, some of which had also been varnished or painted, so dad decided to strip the lot off. This took the entire family days to achieve, and when completed revealed a strange crack in the plaster. Yours truly started poking around, and a large lump came away. Rather than getting a mouthful of abuse, noticed dad had gone very pale and silent - all the layers of crap had hidden rampant dry rot!