As explained by Sufis:
At the beginning of the Sema, by holding his arms crosswise, the semazen appears to represent the number one, thus testifying to God's unity. While whirling, his arms are open: his right arm is directed to the sky, ready to receive God's beneficence; his left hand, upon which his eyes are fastened, is turned toward the earth.
Quoting From Marcus
"In the essays in my addition of Labyrinths there is an essay by Borges dedicated to The Fearful Sphere of Pascal. It traces back how the sphere has been an important symbol for many philosophers. Parmenides: The divine being is like the mass of a well-rounded sphere whose force is constant from the centre in any direction. The music of the spheres. Kepler's model of the universe as interconnected spheres."