In Memoriam is published every Wednesday afternoon and honors those we recently lost in the art world. Milan Knížák (1940–2026)Czech performance artist, sculptor, and musicianThe Czech artist was associated with the Fluxus movement, performing happenings and noise music concerts around the country. He also served as director of the Czech National Gallery in Prague between 1999 and 2011, and was a professor of intermedia at the city's Academy of Fine Arts. "His legacy continues to shape the history of postwar avant-garde art and its relevance today." Simone Forti (1935–2026)Pioneering choreographerSimone Forti in 2015 (photo Jason Underhill)