Verifiable Random Function

An artist's brain is working very much like VRF. It does not know what ideas will arrive in the next moment, in what sequence. It does not know if it will be a valuable idea in advance. But an artist's brain does know how to arrange ideas, so that they become valuable. One after another they will arrange to follow a common trend, which eventually form a recognisable pattern. Out of this pattern the artist builds something unknown beforehand, and at the same time very familiar to the world.