The French philosopher Immanuel Levinas has taught us that it is through our interactions with the face of somebody else, it is through encountering the face of another, that our responsibilities to someone else arise. You cannot look at somebody else, truly look at them, and then walk away without having some kind of sense of a relationship towards that person. But what if the other has no face? What then? Or what if the face of the other is actually the face of another person entirely?
With measurement comes the power to categorize and control. These are technologies that enable us to be judged at a distance, to be identified as a threat or a sales opportunity just by the way we look. Facial recognition takes this further. Not only can we be reduced to a set of externally-verifiable measurements, but these measurements are assumed to somehow constitute our identity.