3533avant-gardeTTen-USVocabulário Colaborativo em Artes e Arquitetura active approved avant-gardeNew or experimental concepts, particularly attitudes, ideas, or works of art or architecture from the late 19th to the mid-20th century, that depart from the existing norm in an original and experimental way.

Source: Art & Architecture Thesaurus

http://vocab.getty.edu/page/aat/300055775

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