From the clifftops of the Isle of Ré to the northern tip of New Zealand, square waves remain one of the ocean’s most visually arresting displays — and one of its most reliable hazards. A 2004 study already documented their link to ship accidents, and the physics have not changed: when two swells collide at competing angles, the water below becomes unpredictable for anyone in it. The checkerboard belongs on the shore, not in it.
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