Zur Physiologie des Sehens und der Farbenempfindung [electronic resource]
A German-language treatise on the physiology of sight and colour perception, published in Leipzig in 1877 by Emil du Bois-Reymond, a physiologist, for ophthalmologists and researchers studying vision. The plate shows colour swatches in a row above two pairs of stippled fields of orange, red, pink and green dots arranged in grids, with figure labels, suggesting how a designer might study colour-dot patterns and graded tonal sampling for textures and halftone-like effects.
![Picture 1 of 1 from Zur Physiologie des Sehens und der Farbenempfindung [electronic resource] (1877), leaf 3](https://img.insideoutlibrary.com/img/200/ia-b21642643-3-0.webp)