Who is the greatest artist of all time? Michelangelo, Picasso, Van Gogh? Perhaps you're thinking Rembrandt, Matisse or Monet. No matter who you pick, it's likely they lived more or less within the last 500 years. However, one artist has been active thru all-time. And that artist is called "earth". Time is one advantage earth has over other artists. While a painting or sculpture may take...