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The lesson to be learned from this picture of archaeologists Ruth Tringham and Tish Prouse excavating house floors in Building 3 is that vision alone is not enough when excavating. By demonstrating with his trowel, Tish explains that he can detect a change marking a different layer in the sound and feel of the trowel’s edge scraping across the floor. Ruth is also listening and has her trowel poised to check on what Tish thinks he has found. They worked together for many hours in 2001, scraping away the floors one by one in the northern end of Building 3.