Expressionism was the only large-scale aesthetic trend in the greater context of international early modernism. It originated in the visual arts – as a counter-concept and highly subjectivist response to the object-centered aesthetics of naturalism and impressionism – and became a cultural revolution which extended into most areas of artistic and social life. Expressionism virtually dominated cultural life in Germany from around 1910 to 1925 and spilled over into many artistic developments abroad. Although groups of artists and writers quickly formed and dissolved and hundreds of manifestos were published, expressionism never had a unified program. There are literally as many different forms of expressionism as there were a…
Knapp, Gerhard P.. "Expressionism". The Literary Encyclopedia. First published 13 January 2006; last revised 30 November -1.
[http://www.litencyc.com/php/stopics.php?rec=true&UID=369, accessed 26 April 2015.]