"Because objects of art are expressive, they are a language. Rather they are many languages. For each art has its own medium and that medium is especially fitted for one kind of communication. Each medium says something that cannot be uttered as well or as completely in any other tongue.
Language exists only when it is listened to as well as spoken. The hearer is an indispensable partner. The work of art is complete only as it works in the experience of others than the one who created it. Thus language involves what logicians call a triadic relation. There is the speaker, the thing said, and the one spoken to. The external object, the product of art, is the connecting link between artist and audience.
Even when the artist works in solitude all three terms are present. The work is there in progress, and the artist has to become vicariously the receiving audience. He can speak only as his work appeals to him as one spoken to through what he perceives. He observes and understands as a third person might note and interpret. Matisse is reported to have said: "When a painting is finished, it is like a new-born child. The artist himself must have time for understanding it." It must be lived with as a child is lived with, if we are to grasp the meaning of his being."
John Dewey, Art as Experience, pp. 110-111.