Portrait of Ogden Nicholas Rood

Peter Von Hess's portrait sketch of Ogden Nicholas Rood, the American physicist and color theorist, rendered in ink on paper. Rood's shoulder-length hair, goatee, and contemplative expression are captured through confident linear hatching typical of nineteenth-century portraiture. The inscription identifies him as a New Haven resident and U.S. citizen. Rood would later become known for *Modern Chromatics* (1879), which synthesized optical science and artistic practice, influencing color theory across disciplines from painting to design well into the twentieth century.