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A photograph of a stack of four round, flat, concrete-grey discs resting on a mound of loose tan sand at an outdoor construction site. The discs are dusted with grey cement and show small pits on their surfaces. Sunlight falls diagonally across the top disc, casting a shadow on its lower half. Part of a white-soled shoe and a foot are visible at the left edge, and reddish-brown soil and scattered stones lie in the background.