But instead of merely turning the lock to certain numbers, the user first forms the lock with a pinching motion that creates a circle outline.

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The dimpled plastic back, similar to that on the Galaxy Nexus -- has a wrap-around illusion and can only be pried off by turning the lock at its base.

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Settling into my four-poster bed, I'm lulled by the sound of the wind spiralling up off the sea, joined by the faint creak of a rocking chair and, just perhaps, the slightest click of a key turning in a lock.

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