Not two, not one
What difference there is between a sunbeam and the sun is seen because of a perceived disparity where none exists. Is there a difference between You and Me, between Left and Right? What difference is there between the one who manifests Vishnu and the one who manifests Shiva? There is not "two," not even "one." For "one" implies there is a difference between "none" and "some," when neither can exist without the other.