Imagine a blind man called Henry who, during his appendectomy, has an electronic device secretly planted deep in his ear by an mischievous surgeon called Richard. This device has the capacity to transmit sound to Henry whenever Richard wishes from nearly any location.
A few days later, Richard, hiding behind a postbox, transmits a short message while Henry is slowly tapping his cane along the sidewalk.
“Reach down.”
This is the first time that Henry has heard a voice other than his own in his head. He knows that others who have heard voices have ended up institutionalized.
Nonetheless, he is curious, and reaches down to the sidewalk.
“Left.” comes the voice again.
Henry obeys and reaches left to discover a $100 bill that Richard has left there. Henry is quite stupefied by this new source of knowledge, and goes home to ponder the enigma. He wracks his brain for an explanation, but finally drifts off to sleep.
The next afternoon while walking to the barber, he hears the voice again.
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