A rock carved with crossing lines, creating triangles.
Describe the discovery and importance of this piece of ancient African art.

It depends on what type of third separates the three notes.for example: if you have two mayor thirds is an "aumented chord"if you have two minor thirds is an "diminued chord"if you have one mayor first and then one minor is a "mayor chord"and inverted is a "minor chord"

  a commission is when someone pays an artist to create a piece of art for them. patronage is when artists basically get a set salary from the government to create art for people. answer: decorative arts are arts used on a decoration of an object that has a use.