Walked with Emma Ma and her father, Mike along Shenzhen’s northern loop expressway (北环大道) from the Nantou Checkpoint to the northern entrance of Zhongshan Park. Our path followed the remains of the second line (二线), the boundary that once divided Shenzhen into the SEZ and New Bao’an County. Cobbled together out of debris and plastic poster banners, a makeshift tent settlement hovers atop the obsolescent wall and a border guard platform falls apart. A section of the former border zone has been converted to a logistics depot for the Nanshan Oil company. Ironic, of course. Across the street in Zhongshan Park, the Ming Dynasty remains of the Nantou City wall have been designated cultural heritage. Impressions of the second line, below.