A visitor takes a photo of an art piece at the Shanghai subway, Oct 31, 2015. [Photo/IC]

An art exhibition, "One-double 11th", is ongoing at the Shanghai subway, with dozens of brightly-colored art installations on display. Passengers walking along the transfer channel near Xujiahui station on Subway Line 1 are enjoying the art. As a celebration for Singles Day on Nov 11, the exhibition is designed to be fun.