We've already seen how digital effects make Game of Thrones' world more believable, but there were some spectacular scenes in the show's fourth season: giant city-states, an undead horse and battles involving thousands of cavalry. Want to know just how important computer graphics were in bringing those moments to life? Graphics house Rodeo FX will gladly show you. As you'll see in the footage below, some environments (such as Meereen's pyramid-laden landscape) depended very heavily on computer effects, with only a few live humans and real-world places involved. And that cavalry battle demanded even more work -- animators populated the field with "smart" horse soldiers that reacted both to each other and the world around them. You may not want to watch the demo clip if you haven't caught up on the show, but it's otherwise worth checking out to see how fantasy and reality can blend together.