Among the titans created by the Renaissance, Engels is the first to name Leonardo da Vinci. Indeed, hardly anyone else could compete with Leonardo in the power and courage of thought and in multilateral scholarship. Over five centuries, the fame of many prominent figures of that time has faded, but the importance of Leonardo is not only not belittled by time, but is growing more and more, despite the efforts of some bourgeois scientists to belittle his importance, to declare him, one of the greatest realistic artists, a mystic, and his art - mysterious and incomprehensible.