The physical and physiological basis of color
A physiology-of-vision treatise by James Wallace, published around 1894 with the publisher unidentified, likely American, and aimed at students of light and colour perception. The three plates pair a triangular diagram of wave fronts spreading from a source with a strip of coloured wave lines labelled violet, yellow and red, and a circular micrograph of fibrous and cellular tissue. A designer might take the clean dotted wavefront geometry and the stacked wave-band rhythm as structural graphics for colour and light themes.
