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- Look at the images at http://euler.slu.edu/~clair/escher/depth . For each artwork, discuss techniques used by the artist to give a sense of depth.
- Look at Escher's Depth (Magic of M.C. Escher #269). What techniques does Escher use to portray depth?
- On a copy of Duccio’s Announcement, notice that lines which head away from the viewer are diagonal. Use a pen and a ruler to extend all of these lines. Do the same for the receeding lines in della Francesca’s Flagellation (painted 150 years later). What difference do you detect?