This was most definitely his own idea.
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Marcel Duchamp technically had seven siblings, but he was directly related and influenced by his two older brothers Jacques Villon and Raymond Duchamp-Villon, as well as his sister and childhood playmate Suzanne Duchamp-Crotti.
Marcel Duchamp is a famous 20th century artist.
Raymond Duchamp-Villon (1876-1918) was a sculptor. His brother was better known: Marcel Duchamp, dadaist painter, sculptor etc.
marcel duchamp
He was born in Blainville-Crevon Seine-Maritime in the Haute-Normandie region of France.