Creation of new forms requires a new set of visual rules. Even a slight change in them can bring about quite different visual outcome.
The concentric lines below are further extended to another center point. This creates unexpected 3D effect that dazzles our eyes.
It's remarkable that group of 2D llines produces illusion of a 3D object more so than 3D object itself.
Some variations of similar concept.
Notice that they all use the same concept and yet the perception we get from each one of them varies a great deal.
Can you see the ginko leaf?
