Future Shock is a 1970 book by the futurists Alvin and Heidi Toffler, in which the authors define the term "future shock" as a certain psychological state of individuals and entire societies. Their shortest definition for the term is a personal perception of "too much change in too short a period of time". The book, which became an international bestseller, grew out of an article "The Future as a Way of Life" in Horizon magazine, Summer 1965 issue. The book has sold over 6 million copies and has been widely translated. A documentary film based on the book was released in 1972 with Orson Welles as on-screen narrator.