[2] His first solo show at the Honolulu Museum of Art took place in April 1929, and featured painted landscapes of the mountains of Kauai as well as fifteen prints.
Mid-way in his career, he included symbols inherited from Greece and Rome, such as centaurs, broken columns, and sphinxes.
As his spirituality deepened, his works became closer to pure abstraction, with orange and vermilion signifying flames and light.
In his last works in the 1960s, he set aside all symbols, returning to painting the cliffs of Kauai, which he had come to view as spiritual entities.
Doi's works were shown at the New York World's Fair and Treasure Island in San Francisco.