Here forms, here colours, here the character of every part of the universe are concentrated to a point; and that point is so marvellous a thing … Oh! marvellous, O stupendous Necessity — by thy laws thou dost compel every effect to be the direct result of its cause, by the shortest path. These are miracles...
Of the eye - The Notebooks of Leonardo da Vinci (Richter, 1888) - I Prolegomena and General Introduction to the Book on Painting