Final answer:
The principle of nonverbal communication is illustrated when Amber's coworker, through body language such as her hunched posture and expression, conveys more about her state of being than her words express.
Step-by-step explanation:
The scenario where Amber's coworker is hunched over and holding her head, and states she's just tired, illustrates the principle of nonverbal communication. Nonverbal communication involves body language, such as gestures and facial expressions, that can convey information beyond what is spoken. Cultural norms often guide the interpretations of these nonverbal signals, influencing how we perceive and interact with others. In this case, despite saying she's fine, the coworker's posture and facial expression might suggest she is upset or not as okay as she claims, which Amber picks up on. This interaction highlights the importance of being attuned to these nonverbal cues, as they can provide additional context to the spoken words and can even contradict them.