His "artifacture" in nature...

http://www.nytimes.com/2009/12/08/science/08angier.html?_r=1&pagewanted=2&tntemail1=y&emc=tnt

Dr. Dutton, author of “The Art Instinct,” pointed out that

perfect shapes were exceedingly rare in nature.

“Take a look at a billiard ball,” he said. “It’s impossible

to imagine that nature threw that one up.” We are predisposed

to recognize “human artifacture,” he said, and roundness

can be a mark of our handiwork. When nature does play

the meticulous Michelangelo, we are astonished.