The poster on the wall ("What is there to fear with the sun in mind, dare to contribute the spring (of youth) to the people -- Learn from the eleven learned Shanghai youth from Chalinchang, Huangshan, who 'first did not fear hardship, secondly did not fear death'"), by Liu Bairong, represents the famous sacrifice-by-drowning of a group of sent-down Shanghai youth at the Huangshan Tea Forest Farm (Chalinchang, Huangshan). Liu's poster was published previously --in large size-- in 1969.