Seen in silhouette, a boy sitting on his father's shoulder watches a yellow rubber duck on the Harbin section of the Songhuajiang River in Northeast China's Heilongjiang province on July 31, 2016. The 18-meter-high rubber duck, designed by Dutch artist Florentijn Hofman, will be displayed here for one month. Harbin is the 28th city where it is displayed. [Photo/Xinhua]