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 the ability to create items that inspire and inform others, often in aesthetically pleasing ways. Creativity is thinking outside of society's norm. It is being able to express oneself in different varieties of arts - painting, poetry, sculpture, style, fashion, etc. Creativity is not common among people. It is the ability to do or create something that others find intriguing.