Calendars were used on Bali and Lombok to determine the correct time for festivals, rituals associated with rice planting, and horoscopes. Calendars were either painted on cotton cloth, or carved from wooden boards as with the example here. The front of this board is entirely engraved with 210 squares (seven days by thirty weeks - this being a full year in the Balinese Pawukon calendar of 210 days) and these are marked with a series of crosses and circles. Some of the squares are also marked with small metal studs. The reverse is engraved with 35 squares (seven days by five weeks for the Balinese/Lombok month of 35 days). The engraving is highlighted with lime powder which has been rubbed into the depressions.