“Time and Again” by Jack Finney

Simon Morley (Si for his friends), a young talented artist, has to sketch soap bars in an advertising agency for a living, which is as boring as it sounds, until one single day changes his life completely. He is invited to participate in a top-secret project of the USA government. Before long he finds out that it has to do with time travels, but no time machines are involved – just careful recreation of the old surroundings where participants can live and absorb the atmosphere of the past, telling themselves they are already there – and then a little hypnosis does the rest.
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