Our individuality, our true inner self, is far more complex than just our physical features. But the minute differences in just two eyes, a nose and a mouth are enough to create 8 billion unique faces. Our physicality is the primary way we distinguish each other, and a portrait is usually sufficient to recognise an individual.
Humans react with strong emotion to faces, finding them attractive, trustworthy, or perhaps unappealing and dishonest, sometimes in an instant. So do our faces convey more about us than we realise? Do they express out inner being, or merely our genetic heritage? Most people believe it's both, but nobody as yet understands how this happens. Humans continue to be a mystery.