(the golden proportion as applied to the human face)
Luca Paoli, Venice, 1509
A face is something formed, something crafted.
The face is the side of an object which stands above all other sides, a highlighted facet of a three-dimensional object: the time-telling side of a pocket-watch, the hand-winding side of a clock. The head of an animal is like the form of a clock and the face is its most telling side. A face is the site of human interface. A cliff has a high and steep face. The surface of a crystal is a geometric arrangement of faces: a facet is simply a small face.
When a speaker of English calls the front of the head a face, the metaphor is a sculptural one. A face is something formed, something crafted.