Science and art, fascination and controversy, all meet in this exploration by physicist Robert Greenler of optical devices and techniques possibly used in the painting of many of the masterpieces of Western Art. Did artists, beginning in the early 1400s, use lenses and mirrors in the creation of their pictures, as painter David Hockney and Charles Falco assert? Also intrigued by this question, Professor Greenler brings his expertise in optics to an examination of the optical tools available over time to the artist.

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