From Wikipedia.
4-D film (sometimes written 4D film) is a marketing term that describes an entertainment presentation system combining a 3-D film with physical effects in the theatre, which occur in synchronization with the film. Because the physical effects are expensive to set up, 4-D films are usually presented only at special venues such as theme parks and amusement parks. However, in South Korea, some movie theaters also have the ability to present a 4-D film and the film Avatar was one of 10 films that have received the treatment, starting with Journey to the Center of the Earth
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