The critically acclaimed new film “Nickel Boys,” based on Colson Whitehead’s Pulitzer Prize-winning novel of the same name, is largely shot from the point of view of its two main characters as they try to survive in an abusive reform school called the Nickel Academy. Director RaMell Ross sits down with Tom Power to talk about his decision to tell the story through the eyes of his two leads, how trauma is built across time and distilled across memory, and how basketball has influenced his filmmaking.