An altar table is a sacred, personal space for a pagan, wiccan or spiritualist. Your altar is defined by you. It can be made of any substance you choose, and can be indoors or outside depending on the purpose you desire. Some choose to have several altars devoted to particular energies, goddesses or gods, or for different rituals that are currently ongoing. In the tradition of Wicca, altar tables are of particular importance. Since many Neo-Pagan traditions currently worship in the home of a member of the fellowship, the altar may be a permanent part of the home or a portable set of items set on a surface which will be consecrated and released at each event. Any surface can be used, although some traditions prefer a particular type of wood, stone, or other natural material. The altar may be of any shape and size, or even a patch of ground. The items brought to the altar may be a random assortment of personally significant items or a particular set with ritual significance. Traditionally, altar items may include but are not limited to: candles of significant colors, cups or bowls or cauldrons, small statues of gods and goddesses, an athame which in most traditions must never be defiled by being used to cause damage, a wand, a bowl of salt, a bell, and possibly some crystals. The altar is usually covered in some sort of cloth. Some traditions separate the items on the altar into the four Greek classical elements, of earth, air, fire and water; other traditions assign gender preferences to the items and believe they signify the masculine/feminine principles.