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The Wharton Group
Discover France: Art Periods: Cubism
A detailed history and explanation of the ideologies behind cubism. Lots of cubism links as well.
Khan Academy
Khan Academy: Art History: Paul Cezanne: The Bather
Features an in-depth look at Paul Cezanne's painting 'The Bather', which is an excellent example of Post-Impressionism art.
Ducksters
Ducksters: History: Timeline of Western Art for Kids
Kids learn about the timeline of the history of western art movements. From Renaissance to the Impressionists and Modern Art.