Maybe you're a diehard Game of Thrones fan. Maybe you're not. Either way, you'll marvel at this behind-the-scenes video. The short clip was put together by Mackevision, one of the VFX (visual effects) studios that worked on Season 4 of the HBO series. As one commenter on Metafilter noted, "The obvious stuff, such as castles in the background, is expected. As is adding in extra troops. But adding the fog, bits of vines and changing the color of the grass are the little touches that enliven a scene. Love they're making mountains just pop in the background to illustrate the VFX work." Another commenter noted, "It feels like a modern-day Python animation." All I can say is that we'll have more on that later today.