Exhibit Piece

"Exhibit Piece" is a 1954 science fiction short story by American writer Philip K. Dick. The story is an early exploration of the concept of shifting realities, a common theme in Dick's subsequent works. The protagonist is a future historian of the 20th century who finds himself shifting in time from the future to that time period. At first, it is unclear whether he is merely a man from the past imagining a future life, or vice versa.