A visionary environment or fantasy world is a large artistic installation, often on the scale of a building or sculpture parks, intended to express a vision of its creator. The subjective and personal nature of these projects often implies a marginal status for the artists involved, and there is a strong association between visionary environments and outsider art.

Outsider art is art made by self-taught individuals who are untrained and untutored in the traditional arts with typically little or no contact with the conventions of the art worlds.