Drawing from Surrealist and Situationist movements, their songs have political and philosophical themes. Vaneigem and Guy Debord were two of the principal theorists of the Situationist movement. Thus the thought of the Situationist International is very important within post-left anarchist thought. He was to remain close to Debord, however, and continued to fund Situationist publications. The Situationist International was differentiated from both anarchists and Marxists. The local Situationist group Contradiction denounced him as a "leftist bureaucrat". He was a founding member of the avant-garde movement COBRA and the Situationist International. His work has been described as whimsical, macabre, shocking and situationist. "Kezia" is a concept album, described by the band members as a "situationist requiem". The book is considered a seminal text for the Situationist movement. He was also known for using Situationist ideas. Mohamed Dahou survived and went on to become involved in the Situationist International. He was a member of the Situationist International from 1961 to 1970. Across the road is the Sailors' Mission, where Situationist International held its conference in 1960. One notable situationist study is Zimbardo's Stanford prison experiment.