Ever since the first manufacturing line, people have bought many goods at a low price because they have been mass produced. The fact that each piece is exactly the same translates into lower cost for the manufacturer and consumer. There is something in people that craves objects that are unique. They want something only they have, and nobody else can possess it. After the beauty of an art piece, this is the value that comes with collecting art. Each piece of art, even if the same artist creates the same design, is unique. Two pieces may look the same, but there are subtle differences in color, form and substance. No artist can even completely recreate their own artwork. One-of-a-kind objects are the main value of art after its beauty.