What is the representation of light and shade on a sketch or map?

Ithink he answer is prolly a

Ithink that'd be 4, sorry if i'm wrong.

The "maple leaf rag" (copyright registered on september 18, 1899)[1] is an early ragtime musical composition for piano composed by scott joplin. it was one of joplin's early works, and became the model for ragtime compositions by subsequent composers. it is one of the most famous of all ragtime pieces.[2] as a result joplin was called the "king of ragtime". the piece gave joplin a steady if unspectacular income for the rest of his life.

J. vincent scarpace makes fish art and if you look it up its very beautiful work. his original work can be found in private or public places in 40 different countries.
he is now retired, but he still makes his unique fish art. he refers to his art as " a personal journey through the use of basic of art elements; line, shape, and colors - resulting in works of art which purposely resemble fish. "