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Geraldo de Barros,photographer and painter, who in 1946, he took his first photographs with a camera that he had built himself, initially photographing football matches on the outskirts of São Paulo. Also during this period, he made experiments consisting of interferences in the negative, such as cutting, drawing, painting, perforating, solarising and superimposing images. In 1947, he became one of the founders of the Grupo 15 [Group 15], a studio in the centre of the city where he built a photographic laboratory.