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In page Charles Crumb:

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In Charles' adult years, his artwork exhibited repetitive and painstaking concentric lines, filling in otherwise normal, Crumbesque drawings, reflecting an obsession with filling every last centimeter of white space. Charles Crumb and his artwork received wide public attention, as a result of the success of the 1994 feature-length documentary film Crumb, in which Charles and some of his work are featured prominently. His artwork, including notebooks filled with tiny gestural marks that suggest handwriting, has been published and exhibited, sometimes in the context of outsider art.