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Art Institute of Chicago
Art Institute of Chicago: Art Access: Finding Polygons in Cubist Art
This lesson plan has learners identifying the use of polygons in cubist portraits.
Yale University
Yale New Haven Teachers Institute: A Man and His Murals
A unit on the Mexican artist, Diego Rivera, that could be adapted to various grades. Includes lesson plans, a glossary, a bibliography for teachers and students, and plenty of information on Diego Rivera.