"Nell stands above the fray and thinks," Finkle-McGraw said. "To the 
other girls, the wall is a decorative feature, no? A pretty thing to run to and 
explore. But not to Nell. Nell knows what a wall is. It is a knowledge that 
went into her early, knowledge she doesn't have to think about. Nell is more 
interested in gates than in walls. Secret hidden gates are particularly 
interesting."