Often slender pinnacles and tabernacles , richly decorated with ornaments and figures, form the main component. Up until the 19th century, altar structures made up of three decorative fields arranged next to one another like a tower were widespread. Mostly crucifixion groups with Mary and John served as figurative ornamentation of the sprinkles , but also figures of saints or depictions of the Man of Sorrows and angels with the tools of Christ's passion and the coat of arms of the client. With the turn towards the Renaissance , the figures were increasingly abandoned and these were replaced by depictions of plants. After the liturgical reforms in the 20th century, the cracks were dismantled in German churches, but positioned individually in other places in the church.