Just following the theme ... decades ago I was in a bus and saw this piece of verse in an ad for an arts event. On the poster was a silhouetted image of a father and small son standing on a hill with these words underneath:
One day, when the sky is a sink of fatty white, I ask him what colour is the sky and he says blue. Look I say and again ask what colour.
He stares up at the dullness of it, the low whited-out mist of it, and says the sky is blue.