Joseph Spear has not spent much time in Washington, but the man who will design one of the most important additions to the city's skyline -- a baseball stadium -- has learned quickly that the city is hard to define. "It depends on who you ask," Spear said. "There's a federal city and a local city. We are 100 percent committed to a ballpark that represents D.C. What does that mean? Our answer is both. We'll do something symbolic of both." So on a recent day at the corner of South Capitol Street and Potomac Avenue in Southeast Washington, Spear ignored the rumble of trucks coming from an industrial warehouse and explained his vision for a 41,000-seat ballpark that one day could rise here like a "V." The facade along South Capitol Street would be built of stone and glass, echoing the grandeur of the District's federal landmarks -- including the Capitol Dome less than a mile north. The other facade, along Potomac Avenue, would have a connected but distinct feel; largely made of steel and glass, this side would be lacey, almost skeletal, and afford views from inside the park of the Anacostia River to the south. Spear moved to a spot that would be outside the ballpark but near where the two facades would meet. "From back here," Spear said, "you could look up [through an open section in the wall], even if you're outside the stadium, and see the scoreboard."