The temple block is a percussion instrument originating in China, Japan and Korea where it is used in religious ceremonies. It is a carved hollow wooden instrument with a large slit. In its traditional form, the wooden fish, the shape is somewhat bulbous. The Temple blocks have five blocks of varying sizes used together to give a variety of pitches. In western music, their use can be traced back to early jazz drummers, and they are not uncommon in modern orchestral music.