Jiang Dong / China Daily

Many families who inherit art are faced with the same problem: whether to make use of the assets as a source of income or to donate them to public institutions so that they benefit more people, says Chen Lyusheng, deputy director of the National Museum of China.

The second donation includes a draft of Shi Lu's iconic East Crossing. The painting depicts a scene of grandeur and a historical moment in which Mao Zedong and his army cross the Yellow River eastward on a boat, signifying a turning point in the War of Liberation (1946-49).

Shi Lu painted it in 1964 to celebrate the 15th anniversary of the 1949 founding of New China. But the original work got lost in the turbulence of the "cultural revolution" (1966-76).

Yang Xiaoyang, head of the China National Academy of Painting, says Shi Lu is "a high mountain that followers find it impossible to climb over" in the history of the country's modern art.

His art marks an important transition for the classical shuimo (ink-and-wash) painting. Shi Lu gave it a modern context, Yang says. "He left irreplaceable influences in painting and art theory."

Shi Lu was among the first few to propose the concept of yi shen xie xing, meaning that artists should use their imagination rather than just reproduce physical forms of what they saw.

His artwork reflects a combination of Realism, Romanticism, Modernism and Symbolism, Yang adds.

Shi Lu's painting Fight in Northern Shaanxi is permanently displayed at the National Museum of China's central hall. It was commissioned for the 10th anniversary of the founding of New China, but upon completion drew criticism from some quarters for depicting a small image of Mao, with his back turned to people against a grand landscape.

He was also imprisoned during the "cultural revolution".

Shi Lu insisted upon his innovative approach to reforming Chinese painting and suffered a mental breakdown.

With his reputation restored after the "cultural revolution", Shi Lu went back to painting and sketching at home and abroad. He died of stomach cancer at age 63.

The research center has employed some 27 Chinese art specialists to study, curate and preserve Shi Lu's works. A compilation of his works' titles is due out in 2016.