Consider “affordances”: a chair may be used for sitting, or as a weapon, or as kindling etc. Likewise, a good tool is made to be approachable for the beginner,

Consider “affordances”: a chair may be used for sitting, or as a weapon, or as kindling etc. Likewise, a good tool is made to be approachable for the beginner, and open-endedly extensible for the expert. They’re the same material, but the hand movements of beginner and expert are very different. Analogously, consider how Simpsons episodes have 2 affordances: to be funny for children and for adults, each for their own reasons.