Photo taken on July 6, 2008 shows courtyard houses "knitted" with pipes at the man-made sinkage square in the Olympic Forest Park in Beijing, capital of China.

Photo taken on July 6, 2008 shows mirage sprayed from the ground in front of the south entrance of the man-made sinkage square in the Olympic Forest Park in Beijing, capital of China.

(Xinhua News Agency July 11, 2008)