To the north of the Square Pagoda is a brick screen wall that is 4.75 meters in width and 6.1 meters in length. It was erected in 1370 (the 3rd year under reign of Hong Wu of the Ming Dynasty) and is the oldest and the best-preserved engraved brick work in Shanghai. On the wall there is a legendary creature named "Tan" which has deer antlers, dragon scale, lion tail, and ox hoofs and various paintings of auspicious implications. The vivid brick sculptures on the wall are all precious art works.