Answer:linear perspective system
Explanation:
"We gain strength, and courage, and confidence by each experience in which we really stop to look fear in the face...we must do that which we think we cannot." - Eleanor Roosevelt
Believe it or not, they were found by four teenage boys!
To me, the golden spiral is the proportional basis that makes the most sense. In a landscape painting the views eye is automatically directed to the center of the spiral and can be used by the artist to put their subject in the eye of the viewer.