The Color Kittens The Color Kittens The Color Kittens is a children's book by Margaret Wise Brown, illustrated by Alice and Martin Provensen published as part of the Little Golden Books series in 1949. The story revolves around two kittens, "Hush" and "Brush," who attempt to create green paint through mixing their other paints. Their attempts lead to a variety of different hues—none of them green. The book's famous catch phrase is "Blue is blue, and red is red! They still need green!" Children's book author and illustrator Paul O. Zelinsky, for whom the book was a childhood favorite and inspiration, said that,
HSL and HSV the mixture of those paints with varying amounts of black or white paint. The HSL model attempts to resemble more perceptual color models such as the natural color system (NCS) or Munsell color system, placing fully saturated colors around a circle at a lightness value of , where a lightness value of 0 or 1 is fully black or white, respectively. HSL and HSV are both cylindrical geometries (), with hue, their angular dimension, starting at the red primary at 0°, passing through the green primary at 120° and the blue primary at 240°, and then wrapping back to red