FTP, identify this airy spirit that appears in Shakespeare's The Tempest.
Among its powers are invisibility, flight, the creation of magical music, misdirection, the creation of storms and fire, and transformation, the last of which is used to change into a nymph in Act I, Scene ii, and to a harpy in Act III, Scene iii.  This creature of ambiguous gender was imprisoned in a pine tree's trunk by the evil witch Sycorax, but then freed by the newly arrived island inhabitants, both of whom it serves in return, creating a storm to exact revenge upon Antonio and his kinsmen at the behest of Miranda and Prospero.  FTP, identify this airy spirit that appears in Shakespeare's The Tempest.
Among its powers are invisibility, flight, the creation of magical music, misdirection, the creation of storms and fire, and transformation, the last of which is used to change into a nymph in Act I, Scene ii, and to a harpy in Act III, Scene iii.  
Ariel