On the chromatology of some British sponges
A scientific paper by Charles Alexander MacMunn, published in London in 1888, on the pigments of British sponges, held by the Royal College of Surgeons of England. The single plate is a spectroscopic chart of the kind used to record absorption bands. For a designer, it offers a striking grid of horizontal bands in greyscale, with blocks of dark and light arranged in stepped rows that suggest data visualisation or a pattern of repeated rectangles.
