Our thinking about the construct of race is very limited. If you don't believe that, take a look at this LA Times story about photographer Tony Gleaton, whose work is currently on display at LMU's Labland Art Gallery. Don't miss the gallery of beautiful images depicting descendants of Africans brought to Mexico by Spanish conquistadors 500 years ago.
http://www.latimes.com/entertainment/news/arts/la-et-gleaton8oct08,0,2928853.story?coll=la-home-middleright
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Thanks to Racialious for the tip.