The circle and triangle, used in the evocation of the seventy-two spirits of the Goetia. The magickian would stand within the circle and the spirit was believed to appear within the triangle. Some believe that the central circle of the triangle was actually a magick mirror, similar to a crystal ball as used for scrying.

In occultism and demonology, Goetia (from the Greek "goeteia", meaning "witchcraft") is a type of magick used for evoking demons or other spirits and obliging them to do the conjurer's will, without falling under their power.

The Ars Goetia, first part of The Lesser Key of Solomon, is a good example of a treatise on this subject, but it was already known and explained in earlier times, in the Key of Solomon and other medieval grimoires.

Many of the so-called demons called upon in Goetia have their roots in earlier pagan gods from the Sumerian and Mesopotamian pantheons, among others. There is also evidence that the texts were highly influenced by Islamic alchemy, although the main structure is firmly rooted in Kabbalah.