Red, green, blue light on three-sided rotatable pyramid.

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(E)Optics - E+5: Color Perception

Red, green, blue light on three-sided rotatable pyramid. The pyramid base is 12 inches on a side. The pyramid can be rotated so that pairs of colors can be summed on each of its surfaces, or the individual colors can be represented. The pyramid is shown here in the position which sums pairs of colors.
UCB Index: 
E+5+5
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E+5+0 Standard color blindness tests and box of colored yarns.
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E+5+10 Newton's color disk: When rotated,appears white.