Language is an open and constantly evolving system. Thanks to this important property, the language can be improved until it is no longer spoken. However, in different eras, people tried not only to ration and improve their language, but also to create new ones. Who invented these languages ​ ​ and why? How did they appear and constructed? The book of Dmitry Kazakov, writer, journalist and translator, is devoted to various languages ​ ​ (from the language of cinema to the language of mystics) and their creators.