A 1930s Vivex colour print made from James Clerk Maxwell and Thomas Sutton's original 1861 tri-colour negatives of a tartan ribbon. Sutton went on to invent the first single lens reflex camera and the first wide-angle lens while Maxwell's theories on electromagnetism, thermodynamics and colour are some of the most important in the history of physics Illustration: Photograph: Thomas Sutton/ James Clerk Maxwell/ SSPL via Getty Images
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