Which Element of Art is 2 Dimensional and enclosed?

A shape

Explain:

A Shape is a two dimensional area that is defined in some way. It may have an outline or a boundary around it or you may recognize it by its area. Free form shapes are irregular and uneven shapes. They often occur in nature.

example square triangle

the answer is counterpoint.

counterpoint definition: "the art or technique of playing a melody or melodies in conjunction with another, according to fixed rules."

counterpoint is present in a lot of baroque music- such as bach (notably his wtc prelude and fugues) and scarlatti, but can also be found in music by mozart, beethoven. it can even be found in music as modern as john williams!