Have you ever pushed a door that needed to be pulled? That moment of confusion is not your fault. Donald Norman spent a career explaining why — and what it reveals about the relationship between design, cognition, and respect.

There is a category of door so common it has acquired a name: the Norman door. It is a door that gives you no reliable indication of whether to push or pull — a door that has been designed without reference to the person who will use it. You hesitate in front of it. You push when you should pull. You feel, for a brief moment, slightly foolish. Then you walk through and forget it immediately, filing the experience under personal incompetence rather than design failure.

Donald Norman would like you to stop doing that. The central argument of The Design of Everyday Things — first published in 1988, its relevance undiminished — is that the confusion you feel in front of a poorly designed object is not your fault. It is the designer's. Good design communicates its own logic. It tells you, through its form and its affordances, what it is for and how to use it. When it fails to do this, the failure belongs to the object, not the user. This sounds simple. It has radical implications for how we think about everything that gets made.

Norman's framework for understanding how people experience designed objects operates at three levels, each corresponding to a different mode of cognitive engagement.

The visceral level is immediate and preconscious — the instinctive reaction to a surface, a shape, a colour, a sound. It happens before thought, and it matters: our first impression of an object influences everything that follows.

The behavioural level is where use happens — where the design either supports or frustrates the person trying to accomplish something. Feedback, consistency, the match between what an object appears to do and what it actually does: this is the level where most design failure becomes visible.

The reflective level is slower and more personal — the conscious assessment of an experience, the emotional residue that determines whether we feel satisfied, competent, or vaguely resentful after an interaction.

What makes this framework useful is not the taxonomy itself but what it implies about the designer's responsibility. A design that succeeds at the visceral level — that looks beautiful, that makes a strong first impression — but fails at the behavioural level is not a success. It is a broken promise. An object that looks like it knows what it's doing and then doesn't is worse than an ugly object that works. Norman is merciless about this, and his book is full of examples — doors, light switches, control panels, computer interfaces — where the aesthetic and the functional have been separated in ways that produce confusion, frustration, and occasionally genuine danger.

The deeper argument running beneath all of this is ethical as much as practical. Design is a form of communication between the person who made something and the person who will use it. When that communication is careless — when an object assumes knowledge the user doesn't have, or provides feedback that misleads, or organises its controls in ways that reflect the engineer's logic rather than the user's — it is disrespectful in a precise sense: it fails to take the user seriously as a person with limited attention, variable expertise, and reasonable expectations. Good design, in Norman's terms, is design that respects its user's humanity. That is a higher bar than it sounds.

Thirty years after its first publication, the book's relevance has only grown. The principles Norman developed for physical objects apply with equal force — often greater force — to the digital interfaces that now mediate most of daily life. The Norman door has acquired countless descendants: the settings menu that buries what you're looking for, the error message that tells you something went wrong without telling you what, the interface that makes the destructive action easier to find than the safe one.

The designer Ilse Crawford — whose work spans interiors, furniture, and what she calls "human-centred design" in the fullest sense — has spent her career arguing that design should be measured by how it feels to be inside it, not how it looks from outside. Her specific critique of contemporary interior design is pointed: most of it, she argues, is optimised for the camera rather than the body — spaces designed to photograph beautifully that feel cold, disorienting, or exhausting to actually inhabit. This is Norman's behavioural level failure transposed into architecture: the triumph of visceral impression over lived experience.

Crawford's approach — designing for warmth, for sensory richness, for the quality of attention a space asks of the people in it — is a reminder that Norman's three levels are not a hierarchy with the reflective at the top. They operate simultaneously, and a design that wins at one level while failing at another is not a success. The measure is always the whole person, in real time, living with what has been made.