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Visitors walk past a grid wall with drums inlaid at the man-made sinkage square in the Olympic Forest Park in Beijing, capital of China, July 6, 2008. The sinkage square is dubbed as "palace under ground", or "the corridor for traditional Chinese arts", which has seven "exhibition courtyards" like the ancient-styled Chinese palace gate, booth, chime, red walls in line, displaying traditional Chinese culture and arts to athletes and visitors from around the world. [Xinhua]