There are only two forces in the world, the sword and the spirit. In the long run, the sword will always be conquered by the spirit. - Napoleon Bonaparte
There are almost numberless phenomena involving color, many of which are optical illusions, or seemingly so. It will be obvious that many are errors of sense; some are errors of judgment; others are errors due to defects of the optical system of the eye; and many may be ascribed to certain characteristics of the visual process. Substantial glimpses of the more important phases of color as related to illusions are presented in this chapter.
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