This book is about "life partners." Each person has their own, unique, as a unique and his life path. But there is a typical relationship of people who are significant for each other, a natural connection between their feelings, actions and thoughts. In the knowledge of these patterns and the ability to take them into account in everyday communication is the ABC of mutual understanding. The book develops a psychological theory of significant relationships. On its basis, the authors offer a convenient symbolic language for their description and a psychological game that will help readers find mutual understanding with the people around them.