Describe the effect of foreshortening and explain how this technique works

What detail is explicit from this paragraph?

What is the definition of aesthetics? a. the material or materials used by an artist to create artwork b. the branch of philosophy that deals with beauty and how it is expressed and appreciated c. the organization or arrangement of different elements within a work of art o d. the school of thought dedicated to examining the question, "what is art? "

What does it mean to have a bias (for example your bias of bts)?