What does Fu Lei think represents the essence of authentic Chinese painting?

In his letter196165438+123 October, Fu Lei highly praised China's Dunhuang art: "I think Dunhuang murals represent the essence of authentic Chinese painting".

He believes that, except for some paintings obviously influenced by Indian Buddhist art, those paintings depicting fragments of daily life are really extraordinary: ingenious creation, meticulous observation and bold and refined techniques, and these paintings have been handed down from generation to generation by unknown painters (all murals span five centuries).