It's really blue out here.
"Monochrome abstraction—the use of one color over an entire canvas—has been a strategy adopted by many painters wishing to challenge expectations of what an image can and should represent. Klein likened monochrome painting to an "open window to freedom." He worked with a chemist to develop his own particular brand of blue. Made from pure color pigment and a binding medium, it is called International Klein Blue. Klein adopted this hue as a means of evoking the immateriality and boundlessness of his own particular utopian vision of the world."- wall text to Blue Monochrome, 1961, Yves Klien
International Klein Blue on Wikipedia
International Klein Blue