Minecraft wiki entry for 0x10c, associated text: Those soliders are just empty models to try the renderer. There's no ai or anything attached to them, they just silently and eerily rotate in place. The space interior, however, has full physics, and is fully editable. The light from the monitor in the distance is dynamic and depends on what the screen shows. A red screen has a red glow and so on. – Reddit, u/xNotch, March 10, 2012