animal kingdom blue crc press catarrhini chromaticity chromosome color color blindness color constancy color theory cone cell dichromacy digital object identifier dorsal stream euclidean space evolution of color vision evolution of color vision in primates ewald hering eye fish frequency green hermann von helmholtz hilbert space how the mind works human eye hummingbird illuminance insect johannes von kries lms color space lateral geniculate nucleus light mammal marine mammal molecular electronic transition monochromacy nanometre occipital lobe opponent process optic chiasm optic nerve optic tract optical illusion pentachromacy primary color purkinje effect purple rgb color model rgb color space red same color illusion semir zeki spectral color spectral sensitivity steven pinker temporal lobe tetrachromacy thalamus thomas young torsten wiesel trichromacy ultraviolet vector space ventral stream visible spectrum visual cortex visual perception wavelength white point