 Example with 96 gradations 
Ay-O represented Japan at the Venice Biennale in 1966 and at the São Paulo Biennale in 1971.He also built the famed "Tactile Rainbow" at the Osaka World's Fair in 1970.In 1971, true to his Demokato debut, he adapted 10 American Naïve paintings and created a rainbow version that he called Nashville Skyline.