Once you have tasted flight, you will forever walk the earth with your eyes turned skyward. For there you have been, and there you will always long t… - Leonardo da Vinci

Learning never exhaust the mind

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.

Having wandered some distance among gloomy rocks, I came to the entrance of a great cavern ... Two contrary emotions arose in me: fear and desire — fear of the threatening dark cavern, desire to see whether there were any marvelous things in it.