Eidolons

An eidolon is a term used to denote a visible image, apparition, or double of a person or thing. It derives from the Greek eidōlon, from eidos meaning form or shape, and is related to the idea of an image and to idol. In ancient Greek and Roman literature, an eidolon can refer to a statue, mask, or phantom that represents something rather than the original object itself.

Classical usage often distinguishes between the original and its image, whether as a temple idol, a conjured phantom, or a likeness observed by others. The concept also appears in philosophical discussions about appearances, image, and deception, where eidola are used to analyze how appearances can stand in for reality. In some contexts, eidolons are described as mental or astral images that can influence perception or belief.

In modern fantasy, science fiction, and popular culture, eidolons are frequently depicted as spirits, doubles, or guardians linked to a character or deity. They may be shown as summoned beings, avatars, or thoughtforms that reflect or amplify the capabilities or essence of the person they accompany. The term is commonly used to evoke a sense of a vivid, independent image that remains connected to its original source.

Spelling and scope: the plural in classical Greek is eidola; in English, both eidolon and eidola are used. The term is distinct from idol, though both relate to image or representation. See also Doppelgänger, avatar, apparition.