Trees, nature's condos for the little guys, are not just a pretty picture. Squirrels, birds, and bugs count on them for a place to live. (I know the lens is about trees and not art. But I love that face-in-the-trees illusion artwork.
Mouth of Flower - Octavio Ocampo This is good art because it is an optical illusion. It could either be just some flowers with a butterfly, or you can also see a womans face. It is very creative in a subtle way.