Illusion

"As with many so-called illusions, this effect really demonstrates the success rather than the failure of the visual system. The visual system is not very good at being a physical light meter, but that is not its purpose. The important task is to break the image information down into meaningful components, and thereby perceive the nature of the objects in view."
Edward H. Adelson

3D from 2D image - III

An alternative to Carnegie Mellon's research by Microsoft.