"The word and concept [of Post-Modernism] have changed over fifty years and have only reached such clarification in the last ten. (...) 'What is Post-Modernism?' It is a question, as well as the answer I will give, and one must see that its continual growth and movement mean that no definitive answer is possible - at least until it stops moving"

Source: Charles Jencks. 1986. What is Post-Modernism? Third Edition 1989. Page 7. Academy Editions London/ St. Martin's Press New York.