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The eraser box is stamped with a mark called "tubogarasu", which means "Pot and Crow". The image is based on the "Crow story" from Aesop's fables. A thirsty crow is unable to reach the water at the bottom of a pot, so the smart crow drops pebbles until the water reaches a level from which the crow can drink. The image was chosen because small wisdom and a lot of effort is important for Seed