The word ‘philosophy’ carries unfortunate connotations: impractical, unworldly, weird. I suspect that all philosophers and philosophy students share that moment of silent embarrassment when someone innocently asks us what we do. I would prefer to introduce myself as doing conceptual engineering. For just as the engineer studies the structure of material things, so the philosopher studies the structure of thought. Understanding the structure involves seeing how parts function and how they interconnect. It means knowing what would happen for better or worse if changes were made. This is what we aim at when we investigate the structures that shape our view of the world. Our concepts or ideas form the mental housing in which we live. We may end up proud of the structures we have built. Or, we may believe that they need dismantling and starting afresh. But first, we have to know what they are. —Simon Blackburn, Think, intro.