Categorical thinking is not a flaw in human cognition — it's a feature that occasionally becomes catastrophic. The psychologist George Kelly spent decades studying how people construct reality not as passive receivers but as active theorists: each of us walks around with a personal system of 'constructs' — paired opposites like trustworthy/untrustworthy, decisive/hesitant — through which we sort everyone we meet. Kelly's insight, from his 1955 Personal Construct Theory, is that we rarely perceive other people directly. We perceive which of our constructs they activate. The practical consequence is strange: you can work closely with someone for years and still be responding to your construct of them rather than to who they've actually become. This matters in business because most interpersonal conflict — the persistent kind, the kind that survives mediation — isn't about facts or interests. It's about two people's construct systems colliding at the level of framing, where neither party realizes the argument is about the categories, not the content. The thing worth doing occasionally is catching yourself mid-interpretation and asking: am I responding to this person, or to the slot I've filed them in?

Think of someone at work you find consistently frustrating. What is the opposite trait you'd use to describe them — and when did you last genuinely check whether that opposite trait was actually absent?

Drawing from Constructivist psychology / Personal Construct Theory — George Kelly