An emphasis on the entertainment value of art cheerfully courses through this fantasy drama, which speculates on the possible inspiration for playwright James Barrie’s Peter Pan. It’s a lush period piece full of passion and whimsy and, at its best, simple fun. All of that can be found in Johnny Depp’s performance as Barrie, a stuck-in-a-rut writer who reconnects with the imagination of youth when he begins spending time with four fatherless boys.