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Report on the opening week of the 48th Venice Biennale by critic Louisa Buck and gallerist Alanna Heiss, who discuss notions of cultural identity and aritsts including Chen Zhen, Doug Aitken and Ann Veronica Janssens. Plus, how do account for the value of art works; Star Trek actor DeForest Kelley dies; Bhutan's first public TV station; choreographer Jiří Kylián and the Nederlands Dans Theatre.