Nintendo has released a 3-part mini documentary about the making of The Legend of Zelda: Breath of the Wild. This first part covers the prototyping phase. It goes into the recently-revealed 8-bit concept build, some of the crazier early ideas and the focus on emergent mechanics. After playing the game for several hours it's struck me how dynamic the world is and how adaptive the enemy AI is. Give this video a look, I found it pretty insightful.