Robert Barry: Marcuse Pieces, 1970-71. Series of invitations (illustration: card with invitation Nr.6: gallery Eugenia Butler, Los Angeles). More informations: Dreher, Thomas: Kontextreflexive Kunst. In: Weibel, Peter (ed.): Kontext Kunst. Kunst der 90er Jahre. Cologne 1994, p.88. PDF: https://dreher.netzliteratur.net/9_KontextKunst_Text.pdf #robertbarry #thomasdreher #conceptart #conceptualart #conceptualartist #conceptualartists #conceptartwork #conceptartist #conceptartists #contextart #contextartwork