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Basically the brain has a
map of the body in it, and it is this brain
map of our body which we perceive as reality.
People who lose a limb, such as an arm or leg, often claim their limb is still there, known as "Phantom Limb Syndrome", because while they may have lost their physical limb, the body map in their brain still has that limb, so for them it's still there, because that's their source reality.