1972-01 - Galleria Blu - Milano - Italy
1972-03-19 - Museum Haus Lange - Krefeld -Germany
1972-1973 - Rotterdam Art News No.6 - Boymans van Beuningen Museum - Rotterdam - Netherlands
1973-03-16 - Galerie nächst St. Stephan - Vienna - Austria
1974 - John Gibson Gallery - New York - USA
1974 September - Galerie René Block - Berlin- Germany
1974-09-26 - Palais des Beaux Arts - Bruxelles - Belgium
1974-10-25 - Stedelijk Museum - Amsterdam - Netherlands
1974-11 - cannaviello studio d´arte - roma - Italy
1974-05-10 - Städtisches Museum Leverkusen Schloß Morsbroich - Leverkusen - Germany
1977 - Galerie Denise ReneÌ Hans Mayer - Dusseldorf - Germany
1977 - Galerie Denise ReneÌ Hans Mayer - Dusseldorf - Germany
1978-09-21 - Bonner Kunstverein - Bonn - Germany
1979 - 03-09 - Museum of Contemporary Art - Chicago - USA
1979-10-07 Groninger Museum - Groningen - Netherlands
1979 - John Gibson Gallery - New York - USA
1988-06-22 - daadgalerie - Berlin - Germany
1992-1994 - Galerie Bugdahn und Kaimer - Dusseldorf - Germany
1994-08-05 - Provincetown Art Association and Museum - Provincetown - USA
1996-03-17 - Philadelphia Museum of Art - Philadelphia - USA
1996-09-13 - MUSEION - Museum für Moderne Kunst - Bolzano-Italy
1997-09-18 - Damasquine Art Gallery - Brussels - Belgium
1998-03-07 - Kunstverein für die Rheinlande - Dusseldorf - Germany
1999 (Goethe-Jahr) - Weimar - Germany
2000-06-Littmann Kulturprojekte-Basel-Switzerland
2002-05-11 - Dusseldorf - Germany
2009-09-18 - Arp Museum Remagen - Remagen - Germany
2011-01-28 - P420 Arte Contempranea - Bologna - Italy
2013 - The Logic of Mountains 1963 -2013 - Freight+Volume - New York - USA
2013-09-28 - Museum Arolsen - Arolsen - Germany
2014-06-28 - Kunstpalais Erlangen - Erlangen - Germany
2015-12-18 - Frac Bretagne - Rennes - France
2016-09-11 - Neue Galerie Haus Beda - Bitburg - Germany
2017-10-14 The Eye of Nature - Arts+Leisure - New York - USA a
2017-10-14 - The Eye of Nature - Arts+Leisure - New York - USA b
2017-10-14 - The Eye of Nature - Arts+Leisure - New York - USA c
