from iMDB:
Taking advantage of the 35mm 2:35:1 anamorphic stock film, cinematographer Daniel Mindel caught as many lens flares (a photographic effect where light sparkles everywhere) in the film as possible, to create a sense of wonder that enhanced the film: "There's something about these flares, especially in a movie that potentially could be incredibly sterile and overly controlled by CGI, that's just incredibly unpredictable and gorgeous." Mindel would create flares by shining a flashlight/pointing a mirror at the camera lens, or using two cameras (and therefore two lighting set-ups) simultaneously.
