As an example, Zurbitu explained the symbolism of a monstrance that Granda designed for Nocturnal Adoration in Madrid. Figures of the Four and Twenty Elders who worship the Lamb in St. John's Apocalypse are placed around the base, separated into three groups; eight kneel, eight bow profoundly, and eight lift bowls of smoking incense according to their degree of spiritual perfection. Around the base of the monstrance's throne, men of the Old Testament prefiguring the Eucharistic sacrifice stand as caryatids. Abraham and Isaac walk to Mount Moriah, recalling the sacrifice of Calvary. Moses and a snakebitten Israelite represent salvation through the Holy Cross. Melchizedek presents his offering of bread and wine, and Isaiah and David proclaim their messianic prophecies.