This document discusses the importance of usability and aesthetics in design. It summarizes Donald Norman's view that usability need not conflict with aesthetics, and that designers must find a harmony between the two. The document then provides examples of design principles from Norman's book "The Design of Everyday Things", such as visibility, affordances, mapping, constraints, and feedback. It emphasizes that good design should follow these principles to ensure intuitive use, rather than violating them for aesthetic reasons. The document concludes by outlining iterative and user-centered design processes that focus on learning through creation and reworking.