Every relationship seems simple at its start. Two people listening to each other, two shells meeting each other, making one world between them. There are no others in the perfect unity of that instant, no other people or things or interests. It is free of ties or claims, unburdened by responsibilities, by worry about the future or debts to the past. And then how swiftly, how inevitably the perfect unity is invaded; the relationship changes; it becomes complicated, encumbered by its contact with the world.