The ocean waves are constantly in motion, sometimes roaring and crashing, other times gurgling softly. Even in chaos, there’s an underlying stability to the cycle. People reshape the sand every day–building sandcastles, digging holes, leaving their marks behind. Just as reliably, the tide wipes the sandy slate clean. The only way to preserve a sandcastle is to build far enough away from the water. But when sea levels rise, what once was safe is no longer out of reach.