Though I may not, like them, be able to quote other authors, I shall rely on that which is much greater and more worthy – on experience, the mistress… - Leonardo da Vinci

In rivers, the water that you touch is the last of what has passed and the first of that which comes: so with time present.

All objects transmit their image to the eye in pyramids, and the nearer to the eye these pyramids are intersected the smaller will the image appear of the objects which cause them.

Perspective is nothing more than a rational demonstration applied to the consideration of how objects in front of the eye transmit their image to it, by means of a pyramid of lines. The Pyramid is the name I apply to the lines which, starting from the surface and edges of each object, converge from a distance and meet in a single point.