In Mongolia, it is customary to keep the ankle bones of sheep and goats "butterfly flower" after eating without throwing them away. There is a legend that throwing away these bones is not auspicious, and it is said that every family stores them in a bone box. The bones are used for children's play and study. For example, in Japan, it is called ohajiki play, addition and subtraction using bones. The bones exhibited at the multicultural exhibition held in Hachioji in March are now displayed at the entrance of the school. If you are in the vicinity, please come and see and touch it!