These are four sheets of paper used while painting. I usually stick a sheet of paper under the painting I’m working on so that I can do little tests of color and wipe off excess paint from the brush before adding it to the painting. I think a lot of other painters probably do this too. I used to just do this on my desk and then about every year or so, I’d paint over it with white house paint. Now I’m in a shared studio and my studio mates were kind enough to lend me two desks, so I’ve been using these papers so the desk does’t get totally destroyed. Sometimes notes get written on them or other times I zone out staring out my window and I draw random things, like the “Cafe” sign from across the street.