The film was shot 90% chronologically. Three separate trips were made to the Princeton University campus. During filming, Howard decided that Nash's delusions should always be introduced first audibly and then visually. This provides a clue for the audience and establishes the delusions from Nash's point of view. The historic John Nash had only auditory delusions. The filmmakers developed a technique to represent Nash's mental epiphanies. Mathematicians described to them such moments as a sense of "the smoke clearing", "flashes of light" and "everything coming together", so the filmmakers used a flash of light appearing over an object or person to signify Nash's creativity at work. Two night shots were done at Fairleigh Dickinson University's campus in Florham Park, New Jersey, in the Vanderbilt Mansion ballroom. Portions of the film set at Harvard were filmed at Manhattan College.