I think of myself not just as a physical presence but as a kind of rational or intellectual presence. I think of myself in terms of a certain set of ongoing goals, projects, and commitments: to write a new paper, to be a good husband, to better understand the nature of persons, and so on. These goals and projects are not static, nor are they arbitrarily changeable. I recognize myself, over my lifetime, in part by keeping track of this flow of projects and commitments. Others, likewise, will often recognize me as a unique individual, not (or not only) by recognizing my physical shape and form but by recognizing some distinctive nexus of projects and activities.
Andy Clark, Natural-Born Cyborgs