Seurat's method to compose "A Sunday Afternoon on the Island of La Grande Jadde " in Barnes Foundation 1 / harmony

The answer to the question "What is art?" is implied in the masterpieceｓ.
Seurat's [Grand Jadde] has become increasingly famous, but I could not find on line any art thesis to convince .
I expect the visual grammar can explain it
Firstly I make the arc model of harmony.




   Seurat [Grand Jadde] in Banes Foundation arc model
The arcs of a limited circle creates the effect of harmony.
The sense of rhythm comes out because the arcs of the same circle are nearby.
The contour line is a continuous melody of arcs.
In this way, art is made on the same principle as music.