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US sculptor Richard Serra (San Francisco, 1939), who is considered to be one of world's most important living sculptors, poses for photographers next to his art installation "The Matter of Time", which is being placed at Guggenheim Museum on Wednesday 18 May 2005 in Bilbao, Basque Country, northern Spain. Installation is composed of seven huge steel art works which "travels around Space and Time", said Serra. (KEYSTONE/EPA/LUIS TEJIDO)