| http://www.w3.org/ns/prov#value | - Extensions: Show students prints of medieval and Renaissance art so that they can see the differences in realism, use of light and shading, symbolism and types of detail in backgrounds, three-dimensionality, and perspective. (Examples of this in the National Gallery of Art in Washington, DC are di Buoninsegna's Nativity with Prophets Isaiah and Ezekiel (medieval), Giotto's Madonna and Child (trans
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