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Diffuse Interreflection.

If a surface is defined to be a 'diffuse reflector' of light  energy, any
light energy which strikes the surface will be reflected from it in all
directions. The amount of light reflected depends on how reflective
the surface is, and on the angle between the surface normal and the
direction of the incoming light. This relationship is expressed as
Lambert's law.

Light which is reflected from a surface is attenuated by the reflectivity
of the surface, which is closely associated with the 'color' of the
surface.  The reflected light energy often is colored, to some small
extent, by the color of the surface from which it was reflected.  

This reflection of light energy in an environment produces a
phenomenon known as 'color bleeding', where a brightly colored
surface's color will 'bleed' onto adjacent surfaces.  The image in this
slide illustrates this phenomenon, as both the red and blue walls
'bleed' their color onto the white walls, ceiling and floor.

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