Constructed situation
A moment of life concretely and deliberately constructed by the collective organization of a unitary ambiance and a game of events.

Situationist
Having to do with the theory or practical activity of constructing situations. A member of the Situationist International.

Situationism
A meaningless term improperly derived from the above. There is no such thing as situationism, which would mean a doctrine of interpretation of existing facts. The notion of situationism is obviously devised by anti-situationists.

http://www.notbored.org/SI.html
http://www.nothingness.org/SI/debord.html
http://serbal.pntic.mec.es/~cmunoz11/debord.html
http://www.sindominio.net/ash/ash.htm
http://www.nodo50.org/cdc/textos.html

Asger Jorn, Vive la Révolution, 1968