The Da Vinci Notebooks
If the rays of light proceed, as experience shows, from a single point and are diffused in a sphere round this point, radiating and dispersed through the air, the farther they spread the wider they must spread; and an object placed between the light and a wall is always imaged larger in its shadow, because the rays that strike it 71 would, by the time they have reached the wall, have become larger.
94:71 : 7. The following lines are wanting to complete the logical connection.