Do you know the 3 primary colors?
its blue, red and yellow btw

Magenta, Yellow, and Cyan

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. 

B.) what tasks you need to complete. this is because if there is even a little focus of what the world is doing, you are missing something that you need to be doing. its self discipline. by goggles you see, and be you goggles you are seeing you. no one else.