A very nice reflection on C. S. Lewis' The Lion, the Witch, and the Wardrobe by Lev Grossman (whom I met once). An excerpt:
But I bristle whenever fantasy is characterized as escapism. It’s not a very accurate way to describe it; in fact, I think fantasy is a powerful tool for coming to an understanding of oneself. The magic trick here, the sleight of hand, is that when you pass through the portal, you re-encounter in the fantasy world the problems you thought you left behind in the real world. Edmund doesn’t solve any of his grievances or personality disorders by going through the wardrobe. If anything, they're exacerbated and brought to a crisis by his experiences in Narnia. When you go to Narnia, your worries come with you. Narnia just becomes the place where you work them out and try to resolve them.
The whole modernist-realist tradition is about the self observing the world around you—sensing how other it is, how alien it is, how different it is to what’s going on inside you. In fantasy, that gets turned inside out. The landscape you inhabit is a mirror of what’s inside you. The stuff inside can get out, and walk around, and take the form of places and people and things and magic. And once it’s outside, then you can get at it. You can wrestle it, make friends with it, kill it, seduce it. Fantasy takes all those things from deep inside and puts them where you can see them, and then deal with them.