Sam Van Aken's grafted fruit trees are still quite young, but this artist rendering shows what he expects the "Tree of 40 Fruit" to look like in springtime in a few years. Courtesy of Sam Van Aken hide caption

itoggle caption Courtesy of Sam Van Aken

Jeff Koons poses in front of one of his sculptures during a media preview of "Jeff Koons: A Retrospective" at the Whitney Museum of American Art on June 24, 2014. Timothy A. Clary/AFP/Getty Images hide caption

itoggle caption Timothy A. Clary/AFP/Getty Images

"Untitled" by Mark Rothko, on display before auction at Sotheby's, New York, in May. Does its value stem from its pedigree? Or is it valuable because of its contribution to the ongoing dialog that is human expression through the ages? Emmanuel Dunand/AFP/Getty Images hide caption

itoggle caption Emmanuel Dunand/AFP/Getty Images

Former President George W. Bush says his favorite from among the portraits he's painted of world leaders is the one he did of his father, former President George H.W. Bush. "I painted a gentle soul," he says. George W. Bush Presidential Center hide caption

itoggle caption George W. Bush Presidential Center

Francis Bacon's 1969 triptych Three Studies of Lucian Freud. Christie's/Getty Images hide caption

itoggle caption Christie's/Getty Images

Vision, drive and a commitment to excellence: Beyoncé performs at Super Bowl XLVII in New Orleans. Ezra Shaw/Getty Images hide caption

itoggle caption Ezra Shaw/Getty Images