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In a movie, you need good actors, whereas in a book, you don't, unless you have a really bad imagination. In a book, your imagination will do the acting for you. Also, the process of revelation is often different. Tension is achieved in a different way.

Source: www.avclub.com
In a movie, you need good actors, whereas in a book, you don't, unless you have a really bad imagination. In a book, your imagination will do the acting for you. Also, the process of revelation is often different.