How the hell can an ice cube turn into an ice sphere using brute force?

In Japan they love to make perfect ice for perfect drinks. For that they use these metal machines to turn huge ice cubes into ice spheres using nothing but brute force. Surprisingly, the ice doesn't break thanks to the MAGICS of physics.


The machines are not new but, if you haven't seen them before, it's an extremely satisfying process. The pressure is huge but the motion is so slow that the cube doesn't crack. It just melts into its new shape thanks to the pressure and the aluminum acting as a heat sink.

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I'm guessing, by the way the ice begins melting immediately, that this thing is heated.