The graffiti wall near Fudan University's campus.

"We're proud of the wall," she says.

"I stop to check for new works when I walk past. I'm amazed at some of the young artists' amazing ideas."

The wall is whitewashed before every summer vacation so art graduates can cover it with new works.

About 20 images coat Tongji University's 100-meter-long wall.

A university spokesman says the school leaves the wall for students to express themselves.

Shanghai Jiaotong University's graffiti wall stretches about 500 meters.

Many of its works have commemorative themes. Poems and cartoons depict students' reluctance to bid their classmates farewell and portray highlights from their school experiences.

The wall became acclaimed in 2011, after a student painted a graphic image of a skull and a train following the major railway accident in Zhejiang province's Wenzhou. The image went viral online.