From Danwei:
In this sculpture at Peking University, an “S” and a “D” represent Science and Democracy, the “Mr. Sai and Mr. De” (˵õÂÖàÁîüScience, Âæ∑ÂÖàÁîüDemocracy)of the May 4 Movement. A ball rests on the “S.” The vulgar interpretion for this goes, “Science may be worth shit, but Democracy isn’t even worth shit” (ÁßëÂ≠¶ËøòÈ°∂‰∏™ÁêÉÔºåÊ∞ë‰∏ªËøû‰∏™ÁêÉÈÉΩ‰∏çÈ°∂).
This statue at a crossroads in Chengdu shows two workers connected by a band symbolizing solidarity. Locals who didn’t know the true name of the sculpture took the band for a zero and called it “The Working Class is Nothing” (Â∑•‰∫∫Èò∂Á∫ßÁ≠â‰∫éÈõ∂). [Full Text]
Also see : Laugh at school campus statues via Days in the Clouds (Chinese) blog.