With future perfect (F2) you jump to a point in the future, turn round and say some action is finished then. Actually a complicated thing and cumbersome and in most cases you can express the same idea much simpler without using F2. This tense existed in Latin and it was imitated by writers.
In current English usage, muse can refer in general to a person who inspires an artist, writer, or musician.
Creativity is an attempt to discover hidden likeness in the universe. It is a search for recognition and order. Many writers and artists have described creativity as something external to the body. They believe that the source of inspiration exists outside the person. Author Joseph Heller describes his own experience. I don't understand the process of imagination though I know that I am very much at its mercy.