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In 1978, James Blinn presented a method of performing what is called bump mapping. Bump mapping simulates the bumps or wrinkles in a surface without the need for geometric modifications to the model. The surface normal of a given surface is perturbed according to a bump map. The perturbed normal is then used instead of the original normal when shading the surface using the Lambertian technique. This method gives the appearance of bumps and depressions in the surface.
http://en.wikipedia.org/wiki/Special:Contributions/Lumal