THE city's longest so-called "graffiti wall" will be completed soon in Changning District, an official said yesterday.

Artists are still painting the 300-meter-long wall on Yan'an Road W., which forms part of the exterior of the Liu Haisu Art Museum, which will open "on a trial basis" on March 19, said Jin Wenyi, its deputy curator.

The wall provides an opportunity for "young artists to express their imagination and creativity," he said.