In art, frottage (from French frotter "to rub") is a surrealist and "automatic" method of creative production developed by Max Ernst. The Bath, a painting by Mary Cassatt (1891-1892). ... Surrealism[1] is a movement stating that the liberation of our mind, and subsequently the liberation of the individual self and society, can be achieved by exercising the imaginative faculties of the unconscious mind to the attainment of a dream-like state different from, or ultimately âtruerâ than, everyday reality. ... Pieta or Revolution by Night 1923 Max Ernst (April 2, 1891 â April 1, 1976) was a German artist. ...
The artist takes a pencil or other drawing tool and makes a "rubbing" over a textured surface. The drawing can be left as is or used as the basis for further refinement. While superficially similar to brass rubbing, frottage differs in being aleatory in nature. Brass rubbing was originally a British mania for reproducing brasses -- commemorative embossed brass reliefs found in church memorials from the 14th and 15th centuries -- onto paper. ...
Frottage is a term used in art to describe a technique developed by Max Ernst in drawings made from 1925. Frottage comes from the French word frotter meaning to rub. Ernst was inspired by an ancient wooden floor where the grain of the planks had been accentuated by many years of scrubbing. The patterns of the graining suggested strange images to him. He captured these by laying sheets of paper on the floor and then rubbing over them with a soft pencil.
Also the term has been used much longer to mean 'taking a rubbing'. As in when one takes a charcoal rubbing of a gravestone or other old engraving. See frot (no longer called frottage) for male-male genital sex. ... Surrealism in art, poetry, and literature utilizes numerous unique techniques and games to provide inspiration. ...
Reference
West, Shearer (1996). The Bullfinch Guide to Art. UK: Bloomsbury Publishing Plc. ISBN 0-8212-2137-X.