Which was the idea of beauty for the greatest genius of all time? The representation of the beauty of Nature is expressed for Leonardo by painting and drawing, according to two fundamental categories: landscape and portrait. The drawings, which often are as good as paintings, were sometimes simple sketches, executed with a quick but confident hand, or real finished works destined to leave an everlasting mark on the history of art. This book contains a great number of pictures relevant to all those paintings and drawings considered to be the most beautiful ones ever made by Leonardo during his extraordinary life.