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.
Leonardo da VinciAnyone who conducts an argument by appealing to authority is not using his intelligence; he is just using his memory.
Leonardo da VinciOf several bodies, all equally large and equally distant, that which is most brightly illuminated will appear to the eye nearest and largest.
Leonardo da VinciA wave is never found alone, but is mingled with as many other waves as there are uneven places in the object where the said wave is produced.
Leonardo da Vinci