The book “Lobachevsky” by Igor Kagan is a fascinating and deep work that takes the reader into the world of mathematics, philosophy and human relations. Inspired by the life and work of the outstanding Russian mathematician Nikolai Lobachevsky, this book not only tells about his scientific achievements, but also plunges into complex issues related to the perception of reality and the true nature of knowledge. Lobachevsky, as you know, became the founder of non-Euclidean geometry, which became a real revolution in mathematics. Kagan, using this historical context, creates a multi-layered narrative that intertwines the facts of Lobachevsky's biography and fictional elements that allow the reader to understand the inner world of the scientist more deeply. The author masterfully conveys the atmosphere of the XIX century, when scientific discoveries collided with traditional views of the world, and draws a portrait of a man who, despite all obstacles, continued to believe in his idea. This book will be interesting not only to lovers of mathematics, but also to those who are fond of history, philosophy and psychology. Teenagers and adults, students and teachers, as well as anyone who seeks to understand how science can change our perception of the world, will find in Lobachevsky many topics for reflection. The book raises important questions about freedom of thought, how society perceives innovative ideas, and how personal beliefs can conflict with generally accepted norms. The topics that Kagan touches on in his work go far beyond mathematics. He explores how science and art can coexist, how personal dramas affect scientific achievement, and how important it is to stay true to your ideals, even when the whole world is against you. These reflections make the book relevant in the modern context, when many scientists face misunderstanding and resistance. Kagan's style is characterized by brightness and emotional saturation. He skillfully combines scientific facts with artistic elements, creating a living picture that captures from the first pages. The reader not only gets acquainted with the biography of Lobachevsky, but also plunges into his inner experiences, doubts and aspirations. Kagan uses metaphors and allegories that make the text not only informative, but also poetic, allowing the reader to enjoy each page. If you are looking for books that combine elements of biography, philosophy and scientific prose, then Lobachevsky will be a real find for you. This work will be interesting to those who appreciate deep reflection and want to understand how science shapes our perception of the world. The book can be an excellent addition to the library of students, teachers, as well as anyone interested in the history of science and philosophy. Do not miss the chance to plunge into a world where mathematics becomes an art, and life an endless search for truth. “Lobachevsky” Igor Kagan is not just a book about mathematics, it is a fascinating journey into the depths of human thought and the desire for knowledge.