 He donated all sales of his piece, “Fireworks,” to the International Red Cross Society for victims’ relief of the San Francisco earthquake.A book of the artists work, "Yamagata", with texts written by Arnold Schwarzenegger, was published in 1990.Some of the works in the book were inspired by the birth of his son Yuta, who later became known as the lead singer in the Japanese hip hop group Yuta and the Bushido Boys.