Plus, a Memorial to the Beirut Blast Is Facing Criticism + Simon de Pury on How Trailblazing Hip Hop Stars Kanye West, Pharrell Williams and Jay-Z Built Bridges Between the Worlds of Music and Art , From a Major Restitution to Iraq to Overworked Guards at the Met: The Best and Worst of the Art World This Week , An Artist’s Memorial on the Site of Last Year’s Devastating Blast in Beirut Has Been Met With Sharp Criticism