When Bungie decided that Destiny was going to be a thing, they needed artists to bring those ideas to life. Artists start coming up with concepts for characters, weapons, and everything in between such as what a rusted car is going to look like in the game. Over time those ideas can evolve into something better once the environment starts coming to life.
The Destiny artists took sometime to do a live Twitch stream in which they discuss the early concept of the game and how some of the things you love or hate about Destiny came to be. The video itself is lengthy, but if you are into things like this, then this video is just for you.
“Making you a better geek, one post at a time!”