To viewers, the painting "Polar Bear Eating Vanilla Ice Cream in a Blizzard" looked like blank canvas, how would the artist of that painting describe a blue canvas and a black canvas?
For the black, I think (if I was said artist) it would be... A crow on a black oak gazing at a darkened house at midnight.
Blue is substantially more difficult, but here goes! Swiftly, a blue-jay swoops through a cloudless sky, chasing a shimmering dragonfly over a pristine lake.
That last one actually sounded rather poetic, although the painter would have to be five for all of those colors of blue on a painting to be the same... None the less, at least the child would be using art!