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Constant found himself in opposition to the SI because he has been primarily concerned, almost exclusively, with structural questions of certain assemblies of unitary urbanism, so that other situationists had to recall that at the present stage of the project it was necessary to put the accent on its content (play, free creation of everyday life).
Internationale situationniste #5
The ex-situationist Constant, whose Dutch collaborators had already been excluded from the SI for having agreed to construct a church, now himself presents models of factories in his catalogue published in March by the Municipal Museum of Bochum. Apart from plagiarizing two or three poorly understood fragments of situationist ideas, this slippery character has nothing better to propose than to act as a public-relations man in integrating the masses into capitalist technological civilization; and he reproaches the SI for having abandoned his whole program of transforming the urban milieu, which he alone is carrying out. Under these conditions, yes!
Internationale situationniste #6
The official artist of the Kingdom of the Netherlands.
Mustapha Khayati, De la misère en milieu étudiant
The exclusion of Constant from the group that united us—I mean the Situationist International—wasn’t gratuitous. It punished the falsification of a project.
Raoul Vaneigem, Self-Portraits and Caricatures of the Situationist International