How can a design lose its purpose according to Norman?

Good design significantly enhances the usability of a product. It makes the product intuitive and easy to use, eliminating the need for detailed instructions or guidance. It ensures that the product's purpose is clear and that it can be used effectively and efficiently. When a product is well-designed, users can understand and use it without confusion or difficulty, which improves their overall experience and satisfaction.

The principles of psychology, cognitive science, and art can be applied in product design by understanding how users interact with and perceive objects. This involves creating intuitive designs that indicate their function and use, such as making a pillar visible to indicate which side of a door is attached to a hinge. Overly complex designs can confuse users and defeat the purpose of the design.

Not considering human logic in product design can lead to confusion and frustration for the user. It can make simple tasks unnecessarily complex and can defeat the whole purpose of the design. It may also result in the user needing additional instructions to use the product, which should not be necessary for simple designs.