Cheese camera

Marcus was crafting this morning. I gave him a tray out of a chocloate box and a few other things. He taped the tray to a sheet of paper, held it in front of his face and said "Look - its a cheese camera". Then he explained it wasn't really a camera. it was actually for hiding behind so people can't see you. He said offhandedly "I don't know why people call them cheese cameras".