It has been said that science fiction is not about the future, but a way of commenting on the present. With that in mind contemplate a vision of New York City in 2140. The seas have risen, and downtown Manhattan is flooded like Venice. The streets have become canals, and boats have replaced cars and busses. Skywalks between buildings have replaced sidewalks. The wealthy have fled uptown, living in “superscrapers” made possible by new building materials.