If you used colored chalk to create an image on the sidewalk, would it be 2D or 3D art? It would be 2D because the sidewalk is flat, It would be 2D because it is not on a computer, It would be 3D because it is an unusual medium, It would be 3D because a sidewalk has a lot of texture,

The linear perspective changed the quality of art because it gave art a sense of reality. it gave the illusion that the background and surroundings were actually close and/or far and a sense of depth. linear perspective change the quality of art following its birth the renaissance period as they want the art to be more realistic and they believe one way to achieve it is to use the method of linear perspective. it uses the principle of math to realistically portray space and depth in art. 

Art? im sorry i dont study lolololol but i hope you find ur anser!