Two men playing tennis in the park this morning. Both wearing washed out beige shorts and bright white shirts. Their arms and legs are flushed the same pink. They are both balding and letting their remaining gray hair grow unhindered in the untended style of Einstein. One wears a blue brace on his right knee, the other wears a blue brace on his left knee. Each hovers at his center mark hitting the ball directly to the other, a tacit agreement not to force the other to chase it much. Matching skills. Matching motivations. The only breaks in the friendly volley occur when the ball falls short, striking the net, or flies too far, striking the fence. A tally of these errors would likely reveal an equal number from each player.