Thinking back to a recent day in November when I crisscrossed Manhattan as I often do—from a morning meeting to a midday lunch to my daughter’s school pickup—I pictured myself as a small dot on a map of the city grid. I might blink red for a moment here, then there, over the course of the day. Taken together, and cross-referenced with the other data I produce like phone calls, credit card transactions, etc., these points could easily be connected by lines tracking my movements to become a visual representation of my day’s activities.
