Frottage

The technique of rubbing with crayon or graphite on a piece of paper which has been placed over an object, or an image achieved in this way. Also simply referred to as rubbing. Such impressions are usually made from such highly textured subjects as leaves, wood, wire screen, gravestones, and manhole covers. It was a technique especially employed by surrealists, one of whom, Max Ernst (German, 1891-1976), first introduced frottage in his works in 1925, often employing such rubbings as part of a collage, or combining frottage with painting techniques. (Artlex.com)

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