The Burning Stones | 
... now I was certain. I'd glanced at the right-hand side of the shelving unit when I'd been fetching tinder for the fire chamber, and somehow I'd saved the image in my mind.
There they were.
The 'bumlets' the squares of linen to keep the benches clean and stop your bum being singed by the hot wood.
....The pile was lower than it should have been.
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I had no idea this was a thing.
Every day a school day.
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