Michelangelo’s, da Vinci’s, Tintoretto’s billion sketches, the quantitative, prepared them for the qualitative, single sketches further down the line, single portraits, single landscapes of incredible control and beauty. A great surgeon dissects and re-dissects a thousand, ten thousand bodies, tissues, organs, preparing thus by quantity the time when quality will count—with a living creature under his knife. An athlete may run ten thousand miles in order to prepare for one hundred yards. Quantity gives experience. From experience alone can quality come.