Why do people create their own new languages—conlangs—when there are 7,000 natural languages in the world? What types of artificial languages are there? How are they similar to natural languages and how are they different from them? What are their prospects in the modern world? Alexander Piperski, author of the book “Constructing Languages: From Esperanto to Dothraki,” says that people invent languages for a variety of purposes: in order to achieve a logical ideal, in order to better understand each other, or simply to please themselves and for others, aesthetic pleasure. Behind every artificial language there are interesting personalities and dramatic stories of success or failure. Esperanto, Solresol, Rho, transcendental algebra, Quenya, Blissymbolics, Paleneo, Na'vi, Dothraki - this is not a complete list of languages that will be discussed in this book, both from a linguistic and historical point of view. Book of the “PostScience Library” series, published by the Alpina Non-Fiction publishing house together with the PostScience Publishing House.