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.
Full Definition of CREATIVITY. 1. : the quality of being creative. 2. : the ability to create. See creativity defined for English-language learners. ADVERTISEMENT.ull Definition of CREATIVITY. 1. : the quality of being creative. 2. : the ability to create. See creativity defined for English-language learners. ADVERTISEMENT.