Light Art

All visual art cause use light in some form, but in modern times photography and motion pictures, use light is especially important. However, with the invention electrical artificial light, the possibilities were expanded and many artists began using the light as the main form expression instead just a vehicle for other forms art.
Examples
As an example artist Austine Wood Comarow works with pure polarized light passing through birefringent materials to create interactive and morphing images. This art form uses no pigments whatsoever, deriving prismatic colors purely from birefringence.