<p><em>Inspired by the many-worlds interpretation in quantum theory, </em><em>I present the concepts of “nousor” and the theory of counterpart, by which </em><em>I make a metaphysical argument that the existence of other parallel worlds could be brought to light by dreams, </em><em>and</em><em> </em><em>that </em><em>counterparts in different wor</em><em>l</em><em>ds can exchange information through the nousor containing information packets</em><em> to ensure the oneness of counterparts</em><em>. Many worlds and all lives there follow the </em><em>rules which are permanent and can not be violated</em><em>. Based on the counterpart theory, I propose a new view on the origin and meaning of </em><em>d</em><em>éjà vu, Planck’s problem</em><em>, and actual dreams, to</em><em> offer a novel way of thinking and a problem-solving paradigm. Governments should collect citizen’s dreams and use group dreams as a critical indicator to predicate catastrophes. </em></p>