This episode was adapted for Circle Round by Rebecca ... Valentina told them all about the rainbow-colored horse, and how the kind creature offered her three wishes when she offered to set it ...

He concluded that red, yellow, and blue were the primary colors from which all other colors were derived, and created a "color circle" to prove ... breaks down into three categories.

Looking into a light device, three colored circles of light flashed before these women's eyes. To a trichromat, they all looked the same, but Jordan hypothesized that a true tetrachromat would be ...