Altares" can be made up of two, three or seven levels. Two levels is a representation of the divsion betwen the earth and the sky, the fruits of the land and the elements of the air, rain, wind, sunshine. Altars with three levels represent the sky, the earth and the underworld. This relates to the Aztec belief system. However, following European conquest, this meaning has changed. Under a Christian world view, the three levels could be either hell, heaven and earth or a representation of the Holy Trinity. Altars with seven levels are the most common and relate to the seven levels that a soul must traverse before reaching heaven (or hell).