Raking light

Raking light, the illumination of objects from a light source at an oblique angle or almost parallel to the surface, provides information on the surface topography and relief of the artefact thus lit. It is widely used in the examination of works of art. ==Examination of paintings== Using raking light, the effects of impasto and the surface textur...
Found on http://en.wikipedia.org/wiki/Raking_light
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