A sample of colored light, as seen reflected from any point in a colored scene, cannot be reduced to the three dimensions of hue, intensity, and saturation, (HIS) or to red, green, and blue (RGB) as on a color computer monitor, because it is composed of a full spectrum of different wavelengths from 400 to 700 nanometers, with a different magnitude for every distinct wavelength throughout that range. Unlike the three-dimensional world of our phenomenal color experience which can be completely captured in three discrete values, the spectral response of physical light is expressible only in N different dimensions, where N is the number of discrete wavelengths between 400 and 700 nanometers of light. If the spectrum were divided into 300 discrete "bins" or frequency bands of 100 nanometers bandwidth each, this would correspond to a 300 dimensional space of chromatic information, which is very much greater than the paltry three dimensions of phenomenal color experience. In fact spectral frequency is actually a continuum rather than discrete wavelengths, and therefore physical chromaticity defines a continuum, or an infinite dimensional space.