"In man, social intercourse has centred mainly on the process of absorbing fluid into the organism, but in the domestic dog and to a lesser extent among all wild canine species, the act charged with most social significance is the excretion of fluid."

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Consider paint a film of light reflecting/absorbing material, and a colored paint a material which gives a particular, characteristic transmission of light via differential absorption and reflection. Call this reflected quality 'luminance' and measure it in millilamberts. This measure is as real and present as height, breadth, depth; and I find the phenomenon equally sumptuous and convincing. . . . Painted light, not color, not form, not perspective, or line, not image, or words, or equations, is painting. I make paintings which do not represent light, they are light.

— Jo Baer