It is one of the more commonly used items found in Chinese traditional religion and are used in temples and home shrines along with fortune sticks, both of which are often used together when requesting an answer from the Deities.
Moon blocks can be used separately to receive a straightforward answer, or they are accompanied by fortune sticks to clarify an oracle.
The querent then kneels and says their name, date of birth, residence, and question while cupping the blocks between their hands in prayer.
After the querent poses the question to the gods, the blocks are dropped to the floor and land in a specific position.
Aside from questioning the deities on mundane affairs, moon blocks are also used to verify a range of issues, such as proper ritual protocol, spiritual presence of the gods or if they have eaten the offerings presented to them.