The face is a central sense organ complex, for those animals that have one, normally on the ventral surface of the head (head (anatomy)), and can depending on the definition in the human case, include the hair, forehead, eyebrow, eyelashes, eyes, nose, ears, cheeks, mouth, lips, philtrum, teeth (tooth), skin, and chin. The face has uses of expression (facial expression), appearance, and identity amongst others. It also has different senses like olfaction, taste, hearing (hearing (sense)), and vision (visual perception).