“Look longer at the picture. It vibrates with Leonardo’s understanding that no moment is discrete, self-contained, frozen, delineated, just as no boundary in nature is sharply delineated. As with the river that Leonardo described, each moment is part of what just passed and what is about to come. This is one of the essences of Leonardo’s art: from the Adoration of the Magi to Lady with an Ermine to The Last Supper and the Mona Lisa, each moment is not distinct but instead contains connections to a narrative.”