Tunnel Under the World
Déja vu: as Guy Birkett goes through the day he has a nagging feeling that he's been here before, experienced this already; except the details are always different. Is it conceivable that he is merely a simulacrum, the ultimate in consumer market surveying? He finds there is a reality behind the reality he knows; but for a pawn to question the reality of the chessboard is a perilous undertaking.
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