Shadow is just the absence of light. It's not real, it has no intrinsic existence. It's the proof that there is light and that something is blocking it, totally or partially. Shadow is natural and necessary. Without it there would be no material existence. Shadow is not Darkness. Matter is the real Darkness, the real enemy of Light. Shadow is potential. It's the path to reach the light that originates it, or to the darkness that gets in the way.