Make lists. And be sure to put odd things on them. Leonardo’s to-do lists may have been the greatest testaments to pure…

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There was another reason, one even more fundamental, that Leonardo did not complete the painting: he preferred the conception to the execution. As his father and others knew when they drew up the strict contract for his commission, Leonardo at twenty-nine was more easily distracted by the future than he was focused on the present. He was a genius u

Painting requires not only intellect, he said, but also imagination.

What also distinguished Leonardo’s genius was its universal nature. The world has produced other thinkers who were more profound or logical, and many who were more practical, but none who was as creative in so many different fields. Some people are geniuses in a particular arena, such as Mozart in music and Euler in math. But Leonardo’s brilliance