The RGB color components varying over On and Off yields a color palette of 8. On Medium Off yields 27.
The human eye is more sensitive to green. Choosing more gradations of green yields palettes of size 12 (2-3-2), 36 (3-4-3), 45 (3-5-3).
The size 36 palette might be interesting because it is a square number. Arrange the palette in a square.
27 suggests the letters in the alphabet, plus a background color. Can a person learn to read color code?
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