Colour theorist posters & prints

Portrait of Michel-Eugene Chevreul 1888 Leon Auguste Tourny

Self-portrait, 1802 Philipp Otto Runge

Self Portrait, 1805 Philipp Otto Runge

Portrait of Otto Sigismund Runge Julius Oldach

Portrait of Pierre Joseph Proudhon French School

Luke Howard, 19th century John Opie

Niccolo Machiavelli, Italian Renaissance political philosopher R Cooper

Herbert Spencer Anonymous

Emmanuel Joseph Sieyes 1817 Jacques Louis David

Friedrich Engels, German socialist and collaborator and supporter of Karl Marx, 1879 Unknown