Which of the following sounds has the highest frequency?
a. a computer battery
b. an air conditioning unit
c. a water heater
d. an electrical outlet

Is there a question?

Perspective is important because it enabled the 3 dimensional world to be translated into the 2d world of the picture plane. this had an immediate impact on the representation of reality in art and design. 

What is the picture?

The technique was mural painting and he used either freshly laid or wet lined plaster. he also use water to merge it with the pigment and plaster creating a internal part of the wall