One analogy I like from Max Tegmark is each human is like an incredibly complex braid, one of the most complex in all the universe. More complex than super computers, stars, and any non living thing in the galaxy. 

Each individual visualized in space time is disparate strands of atoms that converge at conception, that weave through one’s lifetime and shoot back off into randomness as our body turns over the atoms we are composed of. Eventually the braid or rope shoots off back to complete randomness (physics) as our beings ability to attract atoms and make life ceases. Then those atoms continue on the journey through space time. 

 From chapter 11 of our mathematical universe by Max Tegmark