“Since an exhibition celebrating the 90th anniversary of the Palace Museum [in Beijing’s Forbidden City] opened in early September, people have been waiting for up to 10 hours to see this 17-foot-long masterpiece attributed to the painter Zhang Zeduan, an intricate ink-on-silk tableau of life in the Northern Song dynasty capital, Kaifeng. The best-known painting in the museum’s vast collection, it has been shown in public only a few times.”