The father-and-son glass artists Leopold and Rudolf Blaschka sold their handblown marine invertebrate models to universities and museums before the invention of underwater photography. Clockwise from top left, their glass Glaucus atlanticus (the blue sea dragon); Octopus salutii (spider octopus); Stiliger ornatus (sea slug); and the sea anemone Phyllactis praetexta.Credit…President and Fellows of Harvard College; Photos by Joe Michael

















