What is the primary material used for the distinctive upper-floor walls of the Old City's tower houses?
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The iconic tower houses of Sana'a feature dark basalt stone for the lower floors to provide a sturdy foundation against moisture, while the upper floors are built from lightweight, reddish-brown baked clay bricks. These are decorated with white gypsum patterns around the famous stained-glass windows. Photo: ai@ce, Wikimedia Commons, CC BY 2.0.
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Source: Wikipedia (CC BY-SA)
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