“The work of the Icelandic artist Ragnar Kjartansson is all about the quest for beauty and the ways in which that quest is doomed to failure, bogging down in mediocrity or kitsch, or, in these works, the trappings of Las Vegas. But the work radiates so much theatricality and glitz and humor that it feels like a big party. For a show about failure, it sure is having a good time.”