Huang Yongyu, 93, uses the Lunar New Year as an opportunity to comment on social issues and people's behaviors at an ongoing exhibition of his work. Lin Qi reports.

Chinese artist Huang Yongyu, 93, designed a stamp to mark the Year of the Dog in 2006 after being commissioned by China Post. But Huang, who is known for his sense of humor and a down-to-earth style, fell foul of the authorities after he submitted the illustration of a peeing puppy for the stamp.

The design was rejected by the authorities, who then turned to other designers.