A man looks at US artist Jeff Koons' artworks titled 'Made in Heaven' during the presentation of the 'Jeff Koons: Retrospective' exhibition at the Guggenheim Bilbao Museum, in the northern Spanish Basque city of Bilbao on June 8, 2015.   AFP PHOTO/ ANDER GILLENEA RESTRICTED TO EDITORIAL USE, MANDATORY MENTION OF THE ARTIST UPON PUBLICATION, TO ILLUSTRATE THE EVENT AS SPECIFIED IN THE CAPTION        (Photo credit should read ANDER GILLENEA/AFP/Getty Images)