What is the eternal rainbow sea painted with e.g oil on canvas ect. It was created by christian riese lassen.?

Please if you find out tell me a.s.a.p.What is the eternal rainbow sea painted with e.g oil on canvas ect. It was created by christian riese lassen.?
His earlier paintings, such as this one, were oil before he began experimenting with other medium. But I'm not sure if the eternal rainbow sea was painted on canvas or panel, etc.What is the eternal rainbow sea painted with e.g oil on canvas ect. It was created by christian riese lassen.?
It's not painted. This artist does Iris prints on canvas. They're really, truly awful and terribly commercial. It's not high art, it's entirely decorative.