Among 83 numbered grottoes, about 40 of them have rich remains of murals. The most exceptionally rare mural topics in Bizaklik Caves are found in Caves No.16 and 17. Cave No.16 depicts a musician playing Xiao Hu Lei - a lute-like instrument originating from southern China's Yunnan province. The mural Transformation in Hell in Cave No.17 supports the notion Huihu Gaochang was the center of Manicheism from 9 to 12 century.Some murals present clearly the figurines of the Huigu people; some showed Indian monks and portraits of Buddhas at different periods throughout history. They are briefly divided into four periods chronologically.