A genuine work of art must mean many things; the truer its art, the more things it will mean. If my drawing, on the other hand, is so far from being a work of art that it needs THIS IS A HORSE written under it, what can it matter that neither you nor your child should know what it means? It is there not so much to convey a meaning as to wake a meaning. — But a man may then imagine in your work what he pleases, what you never meant! — Not what he pleases, but what he can. If he be not a true man, he will draw evil out of the best; we need not mind how he treats any work of art! If he be a true man, he will imagine true things; what matter whether I meant them or not?
The Fantastic Imagination – George MacDonald
And this one’s better…
Feste's Lute 