Leonardo arouses our undying interest because he has achieved the highest perfection in what all of us mere mortals strive for: comprehensive development, intellectual, creative and emotional. What explains its exclusivity? Bright pages of da Vinci's life, unconventional analysis of his works, unexpected comparisons with contemporary artists - step by step, the author of the book and namesake of the great creator, Leonard Schlein, moves towards answers to the questions “how” and “why”. Schlein examines Leonardo's achievements in art and science through the prism of modern research into the right and left hemispheres of the brain, and the author sees the uniqueness of the brilliant creator in their amazing integration. But for the author, Leonardo’s brain is not an end in itself, but a reason to talk about the peculiarities of human intelligence in general and the evolution of our species. In a sense, this genius is a man of the future, an ideal towards which our species can go if it does not follow the path of self-destruction.