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Since art is dead, it has evidently become extremely easy to disguise police as artists. When the latest imitations of a recuperated neo-dadaism are allowed to pontificate proudly in the media, and thus also to tinker with the décor of official palaces, like court jesters to the kings of junk, it is evident that by the same process a cultural cover is guaranteed for every agent or auxiliary of the state’s networks of persuasion. Empty pseudo-museums, or pseudo-research centres on the work of nonexistent personalities, can be opened just as fast as reputations are made for journalist-cops, historian-cops, or novelist-cops.
Guy Debord, Commentaires sur la société du spectacle
Considering the situation in 1954, Potlatch's judgment concerning the end of modern art appeared rather extreme. We now know, through long experience—although having come forth with another explanation, we are sometimes led to question it—that since 1954 there has never again appeared, anywhere, a single artist of even the slightest value.
Guy Debord, Guy Debord présente Potlatch
Arts begin, grow, and disappear because dissatisfied people break through the world of official expressions and go beyond its festivals of poverty.
Guy Debord, Hurlements en faveur de Sade
The arts of the future can be nothing less than disruptions of situations.
Guy Debord, Hurlements en faveur de Sade
The permanence of art or anything else does not enter into our considerations, which are serious.
Guy Debord, Rapport sur la construction des situations
The decay of art and of all the old codes of conduct had formed our sociological background.
Guy Debord, Sur le passage de quelques personnes à travers une assez courte unité de temps
The arts of passivity are over and done.
Guy Debord, Sur le passage de quelques personnes à travers une assez courte unité de temps
We think that modern art, wherever it has turned out to be genuinely critical and innovative by virtue of the very conditions of its emergence, has performed its role, which was a great one, very well.
Internationale situationniste
Art can be realized only by being suppressed. However, in contrast to the present society, which suppresses art by replacing it with the automatic functioning of an even more passive and hierarchical spectacle, we maintain that art can really be suppressed only by being realized.
Internationale situationniste #9
 
Meanwhile abstraction has invaded all the arts, contemporary architecture in particular.
Ivan Chtcheglov, Formulaire pour un urbanisme nouveau