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Is it just me, or does the area in question seem a brighter white than the rest of the area?
After thumbing through many more relief photos
The Nimrud lens or Layard lens is a 3000-year old piece of rock crystal, which was unearthed by Austen Henry Layard at the Assyrian palace of Nimrud, in modern-day Iraq. It may have been used as a magnifying glass, or as a burning-glass to start fires by concentrating sunlight, or it may have been a piece of decorative inlay.