Screenshot from Rainbow Islands, a 2D platformer. There are many colorful rainbows and a deep blue sky in the background.
Rainbow Islands (Taito, 1987)

As Marina Kittaka puts it in her June 25, 2020 essay entitled "Divest from the Video Games Industry!", video games have an inferiority complex...


Sources:

Entarte Kunst (1937)

Ginder (2004)

Daubigny House website