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Dada obsessesion with war injuries? The artists of almost every city had some variation on prosthetics. Noted Otto Dix's "Card-Playing War Cripples" (Berlin, 1920). The prize in caricature goes to Heinrich Hoerle's "The Cripple Portfolio" (Cologne, 1919-1920). George Grosz joined in with his self-images as an early cyborg, or a "pedantic machine," as he called himself. Even New York had glass eyeballs recurring in the work of Jean Crotti (though he was featured with the Parisians too). Duchamp did the cover of The Blind Man, a journal from 1917. / Best in phrases: "bourgeois precision brain."