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It’s hard not to be impressed by the power of the ocean. The thunderous crash of waves during a storm and more gentle movements of the tides have captured many people’s imaginations. But the power of the ocean is not just poetic – it could literally be used to provide electricity.

Imagine a flat spiral, similar to a snail’s shell, coming closer and closer to a point. Now imagine more spiral lines, all centred on the same point. This shape looks like the clouds over a cyclone, or a whirling galaxy.