Photographed by Stephen Mark SullivanWhen it comes to discussing relationships, we like to focus on the optical kind, like the ever-changing dynamics between the brow bar and the bridge. Think they’ve been together for too long? Are they bored of each other? It doesn’t appear that way. Although they’ve been photographed with some distance between them, we’ve also seen evidence where they appear closer than ever. Perhaps the secret to this union is knowing how to evolve over time to keep things interesting. Smart advice for any relationship.