Zohar The circle is the womb of creation. Yet the circle regenerated by creating a mirror of itself. In this mirror is the first Dyad. It is said that the void contemplated itself, reflected it's own light and cast its own shadow. This was the beginning of all form and duality.
Contrast is absolutely necessary for the recognition of form.
The light defines the dark and vice versa. Magnetic fields are the purest expression of the Dyad. Polar opposites attract and repel and the world is woven between them. The vesica pisces or intersection of two circles is the opening of the womb from which all five Platonic solids and volumes are created. Duality creates polarities and we can feel this principle in everything we engage.