New York City isn't afraid of a little architectural experimentation. Arguably the world's most identifiable metropolis, the largest city in the United States is a magnet for international architects looking to make their mark on the impressive Manhattan skyline. But it's the modern and unmistakable designs of SHoP Architects that have produced some of the biggest local landmarks. Brooklyn's Barclays Center is just one of their wondrous creations, and a tilted twin tower complex at 626 First Avenue is setting the stage for what to expect as work on the supertall111 West 57th Street advances.