The crane in Japan is one of the mystical or holy creatures (others include the dragon and the tortoise) and is said to live for a thousand years: That is why 1000 cranes are made, one for each year. In some stories it is believed that the 1000 cranes must be completed within one year and they must all be made by the person who is to make the wish at the end. Cranes that are made by that person and given away to another aren't included: All cranes must be kept by the person wishing at the end.