The relationship between Cooper and Murph should put an end to the criticisms that Christopher Nolan films lack in emotion. One of Interstellar's stand-out moments, Murphy's message revealing she is now the same age as her father, hinges entirely on the empathy that's being built up with the characters. Throughout the film Murph resents her father for leaving, but, as evidenced by the fact she holds onto his promise, she still wishes he would return. Which makes it strange when, after travelling across the universe to be with her, Cooper is told by an elderly Murph to leave her and go out and find Dr. Brand. Obviously, now with a family of her own, she's gained perspective, finally understanding the reasoning behind what her father did and able to move on from the necessary desertion. But as the finale of Nolan's film things aren't as simple as that. It's another step in human understanding, one of Interstellar's most grand, species-wide messages, which will form our final point.
