Short answer: incubation.
Remark
These 3 documents are an excellent summary of all creative processes where you don't know the answer to something and it is just eluding you. It is not that the problem has no answer. It is just that right now you don't know.
You have gone through all the stages preceding the last one. The artist has thought about what he wants and likely brainstormed answers. Nothing appealed to him.
So he put it away for awhile (incubation). He let it sit until he was sure he had an answer. He probably knew instantly what answer he should pick. That was the evaluation part. The answer struck him right away. But it only happened because he put it away and let time pass before looking at it seriously again.
