Photograph (2016) by courtesy of Joseph Krpelan

Photograph (2016) by courtesy of Alin Bostan

Photograph (2016) by courtesy of Alin Bostan

Photograph (2015) by courtesy of Université Paris Nord

Photograph (2014) by courtesy of Hans Bürstmayr

Photograph (2014) by courtesy of Reiko Toriumi

Photograph (2013) by courtesy of George Gasper

Photographs (2013) by courtesy of Markus Fulmek

Photograph (2013) by courtesy of Hans Bürstmayr

Photographs (2009) by courtesy of Christoph Koutschan

Photograph (2008) by courtesy of Weltstadt Wien

Photographs (2007)

Photograph (2006) by courtesy of Wadim Zudilin.

Photograph (2000) by courtesy of Ruth Wilf.