The tower's base opened up in a cavernous space, its size further empathized by it's nigh-complete emptiness. The control box, a semi-transparant glass case hovering midair with no visible support, proved easy enough to spot. The path up to it swirled around the titanic room's edges like the twirling ribbon of a Ponylympics dancer. The shallow angle made the journey up to the box a great deal easier, a swift gallop bringing them into the bubble where an arcane control panel - made more arcane still by the fact it operated from within the system rather than without - stood quiet, but filled with a steady blue glow that traced outlines throughout its otherwise-inanimate features. It was the first thing that Twilight Sparkle saw that actually had power in this city.