Perspective is a way of drawing, or rendering depth. It is based in math a the fact that parallel lines will never meet, but because of the laws governing distance. they appear to CONVERGE or meet. Below we will see 1 point and 2 point perspectives
There is also 3 point perspective, multi point perspective and ariel perspective. Foreshortening is also a form of 1 point perspective.21perspectivedesc.jpg
Above, in order are, converging parallel lines, followed by 1 point perspective and then 2 point perspective.

The Sistine Chapel.

first, what do you see? what do you think these men saw? What do you think the painting is saying?

d99666306be28aa882d85b60355bb6fb.jpgSimple 1 point perspective drawing by Wayne Thiebaud. This is what Irefer to as freehand perspective as opposed to mechanical perspective where a ruler is used to plot the distance.

Fore shortened image of the Dead Christ by Mantegna and 1 pointAyukaSugiura09.jpg
these books are drawn in both 1 point and 2 point. 1 point is always a flat frontal image as the spine of the book. 2 point always works from an angle where both sides are set from the foremost extended corner or line as in the bottom book.

4_battistero_panorama_02-copy.jpg4510970a36a617c05818b232a15c4a9a.jpg Words

Sandro Bottecelli, the Birth of Venus. the shell, the shell, the shell and the illusion of depth
the first picture is a perspective machine. It worked off of light, a grid located in a frame and plotting the image from a shadow. the second picture is a simple 1 point perspective where the point is Christ's head or right above his head. in these cases perspective becomes symbolic.perspective-presentation8.jpg
Raphael's tour deforce of 1 point perspective and portraiture. The School of Athens. there are many great people located within this painting such as Leonardo and Michelangelo and Raphael himself.
2 point shallow space and 2 point panoramic space.
3991543036.jpg 1 point to the left side383954284_0e634bf6ab.jpg 2 pointCoffee_Cocoa_Tea_(800x633).jpg 1 pointdali_03.jpg
above and below, Dali loved Perspective as it could distort images correctly, but making them seem strange or bentdali_02.jpg Galatia_of_the_Spheres_-_Dali.jpg

De Chirico used 1 point but seemed to have no horizon to place these points upon. his pictures therefore seem distorted or wrapped to an extreme dream like state. He was a Surrealist after all, so this use of multiple points works for his paintings. Like Dali he used perspective as he saw fit.
Giorgio_de_Chirico_-_Mystery_and_Melancholy_of_a_Street.jpg tumblr_lxnwno7mmT1qghk7bo1_1280.jpg

Above and below, Rene Magritte



the perspective here is 1 point, but it is more a freehand distance Technique rather than parallel lines seeming to converge.