What types of techniques did composers of the 20th century use to make their music sound completely different music from other time periods?

They put emphasis on using percussion instruments in new and innovating ways.

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. 

Answer gutzon borglum was both a gifted painter and sculpture;