The relationship between Norm and Core is in terms of sunlight playing over a mountain and a valley. Norm is the brightly lit portion, Core is the dark area occluded by the mountain's bulk. As the sun moves across the sky, Norm and Core gradually trade places with each other, revealing what was obscured and obscuring what was revealed. Norm is solid, focused, hot, dry, and active.

Fire – Sky – The Sun – Day Time.
Core, by contrast is yielding, cold, wet.
Water – Earth – The moon – Night-time.