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By 1964, Richter had collected a vast amount of pictorial source material for his painting, first keeping it in drawers and portfolios. Five years later he began to sift through this material with a critical eye, grouping the individual photographs, reproductions and sketches into different themes and pasting them onto separate panels. Richter then soon recognized the intrinsic artistic quality of these collections of source material and, in 1972, framed the panels and exhibited them at the Museum Hedendaagse Kunst in Utrecht under the title ATLAS. Meanwhile this repository of source material has grown from its original 343 panels to its present 783, with more than 8,000 individual motifs.