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Visitors look at the "Smile Wall"decorated with smiling head portraits of common people. In total of 2008 photos of smiling faces,screened out of over 4000 pieces of works,has been put up onto a six metres in height, 30 metres in length 'Smile Wall'that stands on the lawn at Beijing Chaoyang Park in honor of Beijing 2008 Olympic Games in Beijing Feb 15, 2007.[newsphoto]