Ishihara Color Test

Famous quotes containing the words color and/or test:

    “But whenever the roof came white
    The head in the dark below
    Was a shade less the color of night,
    A shade more the color of snow.”
    —Robert Frost (1874–1963)

    “Whenever a true theory appears, it will be its own evidence. Its test is, that it will explain all phenomena.”
    —Ralph Waldo Emerson (1803–1882)