In Chapter 2 of The Silmarillion, Aulë and Yavanna demonstrate the principle of “opposites attract” even among the Valar, we witness the power of humility, and learn the origins of some of Middle-earth's most mysterious creatures: Dwarves, Ents, and Eagles. We also speculate about the materials Aulë uses to build his own couch to sleep on when Yavanna goes to bed angry.