Photogravure from an early volume of X-rays produced by Josef Maria Eder (1855–1944), a director of an institute for graphic processes, and Eduard Valenta (1857–1937), a photochemist, both from Austria. As The Met comments: "The careful compositions and shocking appearance of these 'Experiments in Photography' link them to the previous century’s tradition of natural-history illustration and point toward the experiments of New Vision photographers in the 1910s and 1920s." (Image source: The Metropolitan Museum of Art)