Reality and Illusion in William Shakespeare's The Tempest
He has not brought the Europeans to the vicinity of the island, but when they do come close to it, he has, through the power of illusion, lured them into his very special realm.
Designing Shakespeare: Illusion versus Reality
Everyone (except for Caliban, Stephano, and Trinculo) finally realize that everything that has happened since the tempest (including the tempest itself) is all just an illusion.
The theatre--that magical world of poetry, song, illusion, pleasing and threatening apparitions--can, like Prospero's magic, educate us into a better sense of ourselves, into a final acceptance of the world, a state in which we forgive and forget in the interests of the greater human community.