An Experiment with Time is a book by the British soldier, aeronautical engineer and philosopher J. W. Dunne about his precognitive dreams and a theory of time which he later called "Serialism". The book discusses two main topics. The first half of the book describes a number of precognitive dreams, most of which Dunne himself had experienced. His key conclusion was that such precognitive visions foresee future personal experiences by the dreamer and not more general events. The second half develops a theory to try and explain them. Dunne's starting point is the observation that the moment of "now" is not described by science. Contemporary science described physical time as a fourth dimension and Dunne's argument led to an endless sequence of higher dimensions of time to measure our passage through the dimension below. Accompanying each level was a higher level of consciousness. At the end of the chain was a supreme ultimate observer. An Experiment with Time has influenced imaginative literature ever since it was published.

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John William Dunne (1875-1949) was a British soldier, aeronautical engineer and philosopher. As a young man he fought in the Second Boer War, before becoming a pioneering airplane designer in the early years of the 20th century. Dunne worked on automatically stable aircraft, many of which were of tailless swept wing design, to achieve the first aircraft demonstrated to be stable. He later developed a new approach to dry fly fishing before turning to speculative philosophy, where he achieved some prominence and literary influence through his "serialism" theory on the nature of time and consciousness, explained in his book An Experiment with Time.