Domestic Ice-Cream Machines usually have a bowl that you place in the freezer to freeze before making the ice cream. When the ice cream mix hits the walls of that bowl it starts to freeze. There is a paddle that slowly stirs (or churns) the ice cream so that the ice crystals form evenly and you end up with a smooth and consistent Ice Cream.
Originally Ice-Cream churns consisted of a bowl of ice and sea salt, into which sat a smaller bowl where you would put the ice cream, into which sat a paddle for churning. These are still available today if you have a nosey around the 'net.
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