Constant was born in
Amsterdam on 21 July 1920 as the first son of Pieter Nieuwenhuijs and Maria Cornelissen. Their second son,
Jan Nieuwenhuys, was born a year later. Both sons became artists although their parents had no apparent interest in art. As a young child Constant drew passionately and showed great talent. He read literature with a special preference for poetry and played musical instruments. During his teenage years he learned to sing and to read music while in the church choir at the
Ignatius Gymnasium, a prestigious
Jesuit school in Amsterdam. In his later years, greatly inspired by
gypsy music, he only played improvised music. He played guitar, violin and at 45 years of age also mastered playing the
cimbalon. Constant painted his first oil painting,
De Emmaüsgangers, at age sixteen. It depicted the revelation of Jesus to two of his followers in
Emmaus. With no money to buy materials he painted this painting on a
jute sugar bag with pigments he had bought from a house painter. Many of Constant's early drawings and paintings are religiously inspired, due to his Jesuit schooling. Yet at the age of twenty Constant turned his back on
Catholicism. On 13 July 1942 he married Matie van Domselaer, the daughter of the composer
Jakob van Domselaer. The city of Bergen was evacuated by the Germans in 1943 and so Constant and Matie moved back to Amsterdam. During this period Constant went into hiding and refrained from registering at the
Kulturkammer (Nazi Chamber of Culture) to avoid the
Arbeitseinsatz (labour supply for the Germans). Because of this he was unable to conventionally exercise his craft or to buy art supplies. To paint Constant used tablecloths and bed linen and had to rinse them out to start again. During the war Constant's brother in law, Jaap van Domselaer, moved into the apartment to hide from the 'Arbeitseinsatz.' He introduced Constant to
Plato,
Spinoza,
Descartes,
Kant,
Hegel and
Marx. Especially the latter provided great inspiration to Constant regarding his later ideas on art and society. During the
winter famine of 1944 Constant's first son, Victor Nieuwenhuys, was born. After the war, Constant, his wife and son moved back to Bergen only to return to Amsterdam in 1946 where they lived in an apartment across from the zoo
Artis. When the war ended Constant was able to expand and grow as an artist after years of captivity and limitations. He liberated himself artistically and experimented with multiple techniques of art-making. He was inspired by
Cubism, especially by
Georges Braque. In 1946 his daughter Martha was born, followed by his daughter Olga in 1948. ==CoBrA==