Man's world is mutable, seas become mulberry fields - Chairman Mao inspects the situation of the Great Proletarian Cultural Revolution in Northern, South-Central and Eastern China
人间正道是沧桑-毛主席视察华北、中南和华东地区的无产阶级文化大革命形势
Renjian zhengdao shi cangsang - Mao zhuxi shicha Huabei, Zhongnan he Huadong diqude wuchan jieji wenhua da geming xingshi
The phrase 'Man's world is mutable, seas become mulberry fields' is from Mao's 1949 poem "The People's Liberation Army Captures Nanking". The Zhejiang Worker-Peasant-Soldier Art Academy is credited on the poster, the individual artists/designers are not mentioned.