Imparting experience
Li Chou-cheng

This is part of what the Chinese once called 'open-door' science.
'... processes of face-to-face contact and exchange appear to be exceedingly important in the transmission and popularization of science in China. Because such exchange generates little or no printed material, western observers, who tend to believe that all scientific communication of any note eventually reaches print, are likely to over-look what appears to be a vast network of informal scientific exchange in the Chinese countryside.' China: Science Walks on Two Legs. New York. 1974. p 48.
From a British exhibition: Peasant paintings from Hu county, Shensi province, China.