Inside, a spiral staircase swoops from a playfully designed stone floor in the lobby to the bar level of the hotel.

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Closer examination of the animals' anatomy revealed that the sea slugs had a large part of their penis coiled up in a spiral inside their bodies, which they would then use to replenish their missing part.

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Long thin tubes, called convection zones, spiral up the inside of the cylinders, gathering nautical winds and generating electricity in the process.

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Inventor, Hideki Watanabe, created the prototype using dental plaster from his practice that he used to line the inside surface of a metal pot in a spiral design.

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