Well this is just a quickie coz i dont have much time but.....
Well the imaginative side of it is obvious.. he is a magician and magic is not real therefore imaginative.
The journey side of it.... well he goes on a personal journey to forgiveness when he realises that though it is hard he must forgive his brother for usurping him and after he has forgiven him, Prospero gives up his magical powers.
That might help, might not.