Long long ago, there was an old merchant who had three sons. “To which one shall I leave my fortune?” he wondered. “It must be to the cleverest son. But which one is the cleverest?”

He called his three sons to him. “Here is some money,” he told them, “You must each take one coin to buy something that will fill this room. Anyone who can do this shall have my fortune.”

“It is a big room,” said the eldest son.