The streets of low-lying areas are paved with permeable surfaces, allowing floodwaters to seep through rather than slosh into basements. Tall grasses dance in a spongy buffer zone of marshland, stretching from the built edge out into the waterways. Scattered in the Upper Bay are archipelagos of tiny artificial islands and floating piers — speed bumps for a storm surge. Beneath the waves, submerged reefs made of old subway cars and oyster beds help diffuse hard-charging currents, and at the same time host an abundance of marine life. In that New York, we will watch the sea come in, serenely confident that it will make an orderly retreat, leaving our vital systems unmolested and our streets unbesmirched.