Marina Abramovic/Ulay: Imponderabilia, 1977. Galleria d’Arte Moderna, Bologna 1977. Performance with video closed-circuit. More informations: Dreher, Thomas: Performance Art nach 1945. Aktionstheater und Intermedia. Munich 2001, p.370f. PDF: https://digi20.digitale-sammlungen.de/de/fs1/object/display/bsb00041413_00369.html #marinaabramovic #ulay #ulayandabramovic #abramovicandulay #thomasdreher #performanceart #performanceartist #performanceartists #performanceartwork #closedcircuit #closedcircuits #videoclosedcircuit #videoclosedcircuits