Why did Michelangelo paint the Sistine Chapel, or Rembrandt obsess over painting his own image? What's the secret behind the Terracotta Army, or Andy Warhol's soup cans? 'Art: Explained' offers straightforward and satisfying answers to 100 of these fascinating questions. If you've ever looked at an art masterpiece in awe, but wondered just what it means, here is your guide.