I recall the tale of one of our "older" captains being asked by a lady visitor to the Flt Deck one night, how he know which way to "steer" the aircraft ? " Well madam, can you see the glow from that red light on the end of the wing ? " Yes, "and can you see the glow from the green light on the other wing ?" Yes. "Well, I just steer between them " I can't recall the response from the lady !