Focus is a Latin word that means hearth — the fireplace that was both literally and metaphorically the center of the Roman household. Various members of the family were responsible for some element of hearth-maintaining — one would chop or gather the firewood, another bring that wood into the house, another make the fire, another add logs when the fire got low or stir it to enliven it, still another to cook the family’s food over the flame — and each member benefitted from its warmth. The heath was a place for preparing food and for keeping warm; it was therefore also the place where the family gathered, where its unity and wholeness were made manifest. The household gods — the lares and penates — were above all the guardians of the hearth. They preserved and in various ways represented the family’s focus.
Controlled fire is of course the paradigmatic technology: Prometheus’s gift of fire to humans is the definitive extension of our natural abilities, an augmentation of power, a prosthesis. But, Borgmann shows, fire-as-focus is much more than that: it generates a set of focal practices that strengthen the bonds among members of the family. Contrast the hearth at the center of a home to a central heating unit, which instead of binding us to one another invites us to go our separate ways. The central heating unit is not a focus that links us to one another; it is rather a device that facilitates our separation.