Mathematicians since Euclid have studied properties of the golden ratio, including dimensions of the golden rectangle (where the ratio of the longer side to the shorter is the golden ratio). This proportion is aesthetically pleasing.
According to the Pythagorium Theory, geometry is a powerful underpinning of the universe. 90 degree angles in rectangles explain much in nature. We can consider also, the power of diagonals and the “theme of two” to aid us in building compositional groundwork.
It’s fun to create my own doodle within the sacred geometry.