Walter Isaacson Quote
On what may be the last page he wrote in his notebooks, Leonardo drew four right triangles with bases of differing lengths (fig. 143). Inside of each he fit a rectangle, and then he shaded the remaining areas of the triangle. In the center of the page he made a chart with boxes labeled with the letter of each rectangle, and below it he described what he was trying to accomplish. As he had done obsessively over the years, he was using the visualization of geometry to help him understand the transformation of shapes. Specifically, he was trying to understand the formula for keeping the area of a right triangle the same while varying the lengths of its two legs. He had fussed with this problem, explored by Euclid, repeatedly over the years. It was a puzzle that, by this point in his life, as he turned sixty-seven and his health faded, might seem unnecessary to solve. To anyone other than Leonardo, it may have been.
On what may be the last page he wrote in his notebooks, Leonardo drew four right triangles with bases of differing lengths (fig. 143). Inside of each he fit a rectangle, and then he shaded the remaining areas of the triangle. In the center of the page he made a chart with boxes labeled with the letter of each rectangle, and below it he described what he was trying to accomplish. As he had done obsessively over the years, he was using the visualization of geometry to help him understand the transformation of shapes. Specifically, he was trying to understand the formula for keeping the area of a right triangle the same while varying the lengths of its two legs. He had fussed with this problem, explored by Euclid, repeatedly over the years. It was a puzzle that, by this point in his life, as he turned sixty-seven and his health faded, might seem unnecessary to solve. To anyone other than Leonardo, it may have been.
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About Walter Isaacson
He has been the president and CEO of the Aspen Institute, a nonpartisan policy studies organization based in Washington, D.C., the chair and CEO of CNN, and the editor of Time.
Isaacson attended Harvard University and Pembroke College, Oxford as a Rhodes scholar. He is the co-author with Evan Thomas of The Wise Men: Six Friends and the World They Made (1986) and the author of Pro and Con (1983), Kissinger: A Biography (1992), Benjamin Franklin: An American Life (2003), Einstein: His Life and Universe (2007), American Sketches (2009), Steve Jobs (2011), The Innovators: How a Group of Hackers, Geniuses, and Geeks Created the Digital Revolution (2014), Leonardo da Vinci (2017), The Code Breaker: Jennifer Doudna, Gene Editing, and the Future of the Human Race (2021) and Elon Musk (2023).
Isaacson is an advisory partner at Perella Weinberg Partners, a New York City-based financial services firm. He was vice chair of the Louisiana Recovery Authority, which oversaw the rebuilding after Hurricane Katrina, chaired the government board that runs Voice of America, and was a member of the Defense Innovation Board.