Chad Witt

Art Brut: Raw art, ‘raw’ in that it has not been through the ‘cooking’ process: the art world of art schools, galleries, museums. Originally art by psychotic individuals who existed almost completely outside culture and society. (Strictly speaking it refers only to the Collection de l’Art Brut. )

Neuve Invention: Used to describe artists who, although marginal, have some interaction with mainstream culture. The expression was coined by Dubuffet too.

Marginal Art: Essentially the same as Neuve Invention; refers to artists on the margins of the art world.

Visionary art/Intuitive art: Raw Vision Magazine’s preferred general terms for Outsider Art. It describes them as deliberate umbrella terms. However, Visionary Art unlike other definitions here can often refer to the subject matter of the works, which includes images of a spiritual or religious nature. Intuitive art is probably the most general term available.

Naïve Art: Another grey area. Untrained artists who aspire to “normal” artistic status, i.e. they have a much more conscious interaction with the mainstream art world than do Outsider Artists.

Visionary environments: Buildings and sculpture parks built by visionary artists – range from decorated houses, to large areas incorporating a large number of individual sculptures with a tightly associated theme. Examples include Watts Towers by Simon Rodia, Buddha Park and Sala Keoku by Bunleua Sulilat, and The Palais Ideal by Ferdinand Cheval.

(taken from Wikipedia)