Kazuo Shiraga (1924 – 2008) was a Japanese modern artist who belonged to the Gutai group of avant-garde artists. He was acknowledged internationally only after his death.

Shiraga is said to have seen the viscosity of tube-ready oil paint as "free." This is compared to the paints he was forced to use in painting school, which were thin ink-based paints. Shiraga would experiment by using his hands and fingers with oil paints in his younger years

-Wikipedia