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@keithprosser
But why on earth would I want the power to choose what I don't desire? A mail sorting machine is a glorified sieve that lets small grains through and blocks larger grains. Sieves have no desire to distinguish between large and small grains - they do not choose. If there are common features between how sieves work and how human choice works they seem less important and less interesting to how sieves and people are different.
Interestingly, the ancient Chinese character for "discern" is a pictogram of a winnowing basket (for separating wheat from chaff).