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-----Original Message-----
From: John Clement
Sent: Friday, February 07, 2003 3:35 PM
Subject: Re: a link to some interesting illusions
The key to color constancy is that we do not determine the color of an
object in isolation; rather, the object's color derives from a
comparison of
the wavelengths reflected from the object and its surround. In the rosy
light of dawn, for instance, a yellow lemon will reflect more long-wave
light and therefore might appear orange; but its surrounding leaves also
reflect more long-wave light. The brain compares the two and
cancels out the
increases.