Rectangles support the Bayesian Art point of view of prior images to be taken into account, our mental imagery is not flat.
"Models should be as simple as possible, but not more so, personal taste matters."
Einstein, Neither math and myths are uninteresting and shallow.
The blue sky project of indigo homemade oil sticks.
Isatis tinctoria = Dyer's woad (Marlahan mustard) was cultivated for several centuries in Europe as a source of blue dye.
Archimedes, meaningful colors is only side of a rectangle in the web of art sites.
No need for a crystal ball, figure painting with authentic natural indigo.
Looks like a cuttlefish black pigment, but actually made with genuine natural indigo extracted from isatis tinctoria.