see and think what is similar and what is different. Things can be more or less diverse, but oppositions, contrasts are a par­ticu­lar way to convey the difference. On reflection, opposites are one of the most used methods to quickly and immediately breakdown complex compositions into simple, well-defined but connected pieces. Artists have used this knowledge for centuries because simplicity supports a clear artistic language and oppositions emphasize ex­pres­sion and interaction, whether it is literature, music, painting, sculpture, product design or as in this book: Architecture. The Circle of Form continues this tradition, but with a systematic and modern perspective. The theoretical approach of this book continues the author’s previous re­search into art theories, perception, cognitive theories and neuroscience related to visual experiences.