Joseph Antoine Ferdinand Plateau (14 October 1801 – 15 September 1883) was a Belgian physicist and mathematician. He was one of the first people to demonstrate the illusion of a moving image. To do this, he used counterrotating disks with repeating drawn images in small increments of motion on one and regularly spaced slits in the other. He called this device of 1832 the phenakistiscope. Biography Plateau was born in Brussels. His father, Antoine Plateau (fr) born in Tournai, was a talented flower painter. At the age of six, the younger Plateau already could read, making him a child prodigy in those times. While attending primary school, he was particularly impressed by a lesson of physics; enchanted by the experiments he observed, he vowed to discover their secrets someday. Plateau spent his school holidays in Marche-les-Dames, with his uncle and his family; his cousin and playfellow was Auguste Payen, who later became an architect and the principal designer of the Belgian railways. At the age of fourteen, he lost his father and mother; the trauma caused by this loss made him fall ill. On 27 August 1840, Plateau married Augustine–Thérèse–Aimée–Fanny Clavareau, and they had a son a year later. His daughter Alice Plateau married in 1871, who became his collaborator and later his first biographer. Fascinated by the persistence of luminous impressions on the retina, Plateau performed an experiment in which he gazed directly into the Sun for 25 seconds. He lost his eyesight later in his life and attributed the loss to this experiment. However, this may not have been the case, and he may have instead had chronic uveitis. Plateau became a foreign member of the Royal Netherlands Academy of Arts and Sciences in 1872. Plateau died in Ghent in 1883. Academic career Plateau studied at the State University of Liège, where he graduated as a doctor of physical and mathematical sciences in 1829. In 1827, Plateau became a teacher of mathematics at the "Atheneum" school in Brussels. In 1835, he was appointed Professor of Physics and Applied Physics at the State University in Ghent. Research Optics In 1829, Plateau submitted his doctoral thesis to his mentor Adolphe Quetelet for advice. It contained only 27 pages but formulated a great number of fundamental conclusions. It contained the first results of his research into the effect of colours on the retina (duration, intensity, and colour), his mathematical research into