Constant Anton Nieuwenhuis (born 1920) is one of the foremost innovators of Unitary Urbanism. Generally known simply as Constant, in 1948 he founded the Experimentele Groepe de Hollande with Corneille and Karel Appel. They then went on to link up with Christian Dotrement, Joseph Noiret, Belgium and Asger Jorn, Denmark to form CoBrA. Scorched Earth I (1951) is one of his noted works from this period.

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"Creation and revolutionary struggle have the same objective: the realisation of life."