A bed of nails consists of a piece of wood, the size of a bed, with nails pointing upwards out of it. It appears to the spectator that anyone lying on this "bed" would be injured by the nails, but this does not happen. If the nails are numerous enough, the weight is distributed among them so pressure exerted by each nail is not enough to puncture the person's skin.
Uses:
-Magic tricks
-Physics demonstrations (principles of weight distribution)
-Meditation (particularly in Asia)
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