The clip highlights how an ancient Egyptian building method -- the Nubian vault -, which requires only earth and water, was rediscovered by a Frenchman who transmitted this technique to Burkinabese masons. Today, the masons train apprentices, and the project has resulted in hundreds of dwellings that have been built by a qualified, local labor force. To watch this, as well as many other documentaries on the subject, visit: http://www.unesco.org/archives/multimedia
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