Leonardo had been taught 15th century painting traditions and was ready to test out new ideas. Some of his ideas are believed to have come to him through observing nature while in the countryside of Florence.
He began this testing process by thinking and drawing the overall design of his paintings. He sketched different arrangements of the background to test out different perspectives to achieve his desired goal and then placed other things into his paintings that would draw attention to the main idea of his work.
He used