| 1998 |
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Stanford University, Department of Art, California, USA |
| 1999 |
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Senate Paris, "intersculpt '99", Symposium on digital sculpture, France |
| 2000 |
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University of Hawai'i at Manoa, Honolulu, USA |
| 2002 |
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Gulbenkian Foundation, "The Nothing... Nada Symposium", Lisbon, Portugal |
| 2003 |
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Cheltenham Science Festival, "scientists are from Mars, artists are from |
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Venus", England |
| 2005 |
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Kunstmuseum Bonn, Symposium, "Bilder, Formen, Bewusstsein", Germany |
| 2005 |
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Café des Sciences, "Science et art; trafic d'influence", Geneva, Switzerland |
| 2007 |
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Alanus Hochschule für Kunst und Gesellschaft, Alfter/ Bonn: Symposium: |
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"X-Over - Die bewegende Kraft der Kunst": Title of talk: "Zeichnung: |
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: Aesthetik, Symbol und Wirklichkeit" |
| 2007 |
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The Globe, CERN, Geneva: "Parallel tracks in art and science." |
| 2008 |
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L'Atelier, Genève: "Le dessin: esthétique, symbolique et réalité" |