What are sylphs?

In mythology, all of the elements have spirits and each spirit/element is given responsibilities.

Sylphs, who represent air, are given the eastern corner of creation from whence new ideas dawn. They reign over souls with mirthful, changeable and eccentric temperaments and are the patrons of inspiration, creativity and genius.

Sylphs are the elemental nomads, invisible but ever-present powers in the creative activity of the universe.