Drum of Raijin/Origin

Raijin is the drums of the Japanese lightning god Raijin ( 雷 神). He is typically depicted as a demon-looking  spirit beating drums   to create thunder. Some Japanese parents tell their children to hide their belly buttons (or navels) during thunderstorms. This is due to a folk belief that Raijin is sometimes credited with eating the navels or abdomen of children, and in the event of thunder, parents traditionally tell their children to hide their navels so that they are not taken away. Raijin's companion is the demon Raiju. In Japanese art, the deity is often depicted together with Fujin the wind god.