Relive the emergence of one of the most famous artistic movements of the second half of the 20th century. Opera Gallery brings together the big names in informal art such as Karel Appel, Jean-Paul Riopelle and Georges Mathieu at the end of a manifesto exhibition. Abstraction, tachism, materialism... The institution shows here the diversity of this post-war movement by dissecting its main trends. The work of Hans Hartung, champion of gestural, lyrical and passionate painting, is therefore confronted with the harsh and sensual canvases of Jean-Michel Altan, and the monochromy of the great crusher of black Pierre Soulages.