What Greek mathematician came up with the idea of the octave and first focused on the pleasing sounds that some notes make together

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? "

This is a picture i'm drawing for my art class! i need to know if it good (first of all) and that it represents dia de los muertos (

The main subject of greek art during the classical period was?