The length of a gaze, the frequency of glances, patterns of fixation, pupil dilation, and blink rate are all important cues in nonverbal communication.
Backward glances are shown through rear view mirror techniques and distorted reflections off a champagne bowl question the reason and nature of what might be obvious.
In the opening scene, they are shown shyly exchanging flirtatious glances, while out walking with another boy and girl, who are in a romantic relationship.
