Marcel duchamp created a new art form in which the artist makes nothing, but merely labels an object as art. he called this art form: a. the machine aesthetic. b. ready-mades. c. automatism. d. pointillism. e. instantaneous art.

b. ready-mades

The ready-mades are ordinary objects that have already been manufactured for everyday use. By simply selecting the objects, the artist already considers it as art. 

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.