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Well, just to add to that, our minds play tricks on ourselves with color and brightness constancies (or the lack thereof).  Perceptual constancies are sources of illusions.  According to wikipedia, “color constancy and brightness constancy are responsible for the fact that a familiar object will appear the same color regardless of the amount of or color of light reflecting from it. An illusion of color or contrast difference can be created when the luminosity or color of the area surrounding an unfamiliar object is changed. The contrast of the object will appear darker against a black field which reflects less light compared to a white field even though the object itself did not change in color. Similarly, the eye will compensate for colour contrast depending on the color cast of the surrounding area.”

Example 1. Simultaneous Contrast Illusion:  The horizontal gray bar is the same shade throughout

Example 2: Color constancy – In this illusion, the second card from the left seems to be a stronger shade of pink in the top picture. In fact they are the same color, but the brain changes its assumption about color due to the color cast of the surrounding photo.

You can read more at: http://en.wikipedia.org/wiki/Optical_illusion