The invisible thinking behind a product, the mental model, the interaction model and the base primitives, has long been the unsung hero of product designers.

the invisible thinking that goes behind building a product. That's one that I think I expect and hire for at Anthropic and I think has been the long unsung hero of product designers everywhere is like the mental model, the interaction model, like the base primitives that compose how you think about what you're interacting with.