Merlin remembered the future and anticipated the past. Benjamin Button aged backwards. These things are hard to imagine, but imagine something even stranger: someone whose life is like yours, but played fully in reverse, frame for frame. Merlin and Button both walk and talk normally. In contrast, if you record yourself and play it in reverse, you’ll see someone who walks backwards (without slipping) and talks backwards (without slipping up). What would it be like to be such a creature, a genuine time-reverse twin? Would such a twin feel the same as you’d feel if the rest of the world were running in reverse? Would she have experiences at all? And why does it matter?
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