If you love concept art as much as we do, then you're going to want to bookmark the new site of artist Thomas Scholes. Along with tons of art he's created for Halo 4, Guild Wars 2, Ashen and other properties, he's also posted some "making of" GIFs that are amazing to watch. Over and over.
Only the AIs with their metal balloon bodies could build the ray-capture cells that provided energy for the whole planet. They worked tirelessly in factories steaming with byproducts, surrounded by the gleaming rectangles created to capture gamma rays.