Art 41 Basel: Switzerland's contemporary art fair

Clockwork for Oracles II (2008), an installation by artist Ugo Rondinone, represented by Gladstone Gallery, New York Photograph: Patrick Straub/AP Photograph: Patrick Straub/guardian.co.uk Labirinto e Grande Pozzo (1969/2010) by Michelangelo Pistoletto, represented by Galleria Continua, San Gimignano, Italy Photograph: Patrick Straub/AP Photograph: Patrick Straub/guardian.co.uk Romance (2009), a work by Jack Pierson, represented by Christian Stein, Milan Photograph: Patrick Straub/AP Photograph: Patrick Straub/guardian.co.uk Ikurrina Quarter (2009) by Sergio Prego, represented by Galeria Soleded Lorenzo, Madrid Photograph: Patrick Straub/EPA Photograph: Patrick Straub/guardian.co.uk Hero (2009) a sculpture by Zhang Huan, represented by the Pace Gallery, New York Photograph: Patrick Straub/EPA Photograph: Patrick Straub/guardian.co.uk From left: Ix, Miss Satin, Zizi, Marguerite de Ponty and David the Proprietor (2006-2008) by Urs Fischer, represented by Galeria Eva Presenhuber, Zurich Photograph: Patrick Straub/EPA Photograph: Patrick Straub/guardian.co.uk Frontier (2009), a video installation by Doug Aitken, represented by 303 Gallery, New York Photograph: Patrick Straub/EPA Photograph: Patrick Straub/guardian.co.uk Three Sets of Tangented Arcs in Daylight and Cool White (1969) by Dan Flavin, represented by David Zwirner, New York Photograph: Patrick Straub/EPA Photograph: Patrick Straub/guardian.co.uk Animal Farm (1994) by Tim Rollins and KOS, represented by Eva Presenhuber gallery, Zurich Photograph: Patrick Straub/AP Photograph: Patrick Straub/guardian.co.uk The Conference (2010) by Gerda Steiner and Jörg Lenzinger, represented by Stampa, Basel Photograph: Patrick Straub/EPA Photograph: Patrick Straub/guardian.co.uk Ville Spatiale (2010) by Yona Friedman, represented by Kamel Mennour, Paris Photograph: Patrick Straub/EPA Photograph: Patrick Straub/guardian.co.uk