The world of spaceships, thumbs, and paper music

It is said we evolved from apes, a big grizzly animal that did not have thumbs. As we evolved, we grew thumbs because we needed to press the space key on our computer and … or maybe grip objects.  This evolution amongst many others (I hope) kept us alive. I believe that evolution is the key to surviving the ever-changing environment around us. But how does this relate to paper?