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In page Theo van Doesburg:
"Theo van Doesburg was born Christian Emil Marie Küpper on 30 August 1883, in Utrecht, the Netherlands, as the son of the photographer Wilhelm Küpper [nl] and Henrietta Catherina Margadant. After a short training in acting and singing, he decided to become a storekeeper. He always regarded his stepfather, Theodorus Doesburg, to be his natural father, so that his first works are signed with Theo Doesburg, to which he later added the insertion "van".
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