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 is converging parallel lines, followed by 1 point perspective and then 2 point perspective.

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The Sistine Chapel.

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.

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Fore shortened image of the Dead Christ by MantegnaAyukaSugiura09.jpg
these books are drawn in both 1 point and two point. 1 point is always a flat frontal image. 2 point always works from an angle where both sides are set from the foremost extended corner or line as in the bottom book.

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Sandro Bottecelli, the Birth of Venus. the shell, the shell, the shell and the illusion of depth
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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.
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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.
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Is it perspective of a visual trick? Magritte also a surrealist used perspective and then seemed to use perspective.Magritte_1_Point_Perspective_example.jpgTSOA_15.png

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