A painter should begin every canvas with a wash of black, because all things in nature are dark except where exposed by the light.
Leonardo da VinciI have discovered that a screw-shaped device such as this, if it is well made from starched linen, will rise in the air if turned quickly.
Leonardo da VinciIn rivers, the water that you touch is the last of what has passed and the first of that which comes; so with present time.
Leonardo da VinciAll our knowledge hast its origins in our perceptions … In nature there is no effect without a cause … Experience never errs; it is only your judgments that err by promising themselves effects such as are not caused by your experiments … Science is the observation of things possible, whether present or past; prescience is the knowledge of things which may come to pass.
Leonardo da Vinci