Thinking of faces, wondering whether an eye is a surface or a hole. Everything else on a face is either a surface or a hole—cheek or nostril, chin or ear. But an eye is a hole! It's a light hole—letting light in or out of the face
So everything (not just on faces but everything!) is either a surface or a hole—every part of traffic, every food, every body—everything is a set of surfaces (something) and holes (lack of something)—everything is surfaces punctured by holes, holes punctuated by surface!