Rainbow Dash trotted past a marquis marked "Futureport" and "Departures." Tonguing the inside of her mouth, she hung a left, following what turned out to be an elaborate, zig-zagging line framed by silver metal rails. The interior of the structure was cool, dark, and dim. Directly above, an angled slitted ceiling glowed with soft neon blues and purples from within. The far walls were lined with glowing lights, giving the entire place an ethereal look and texture. Somewhere—as if from deep within the ceiling itself—Rainbow Dash heard soft lobby music playing with violins and a mellow horn section.
"So... uh..." Rainbow Dash murmured as she softly padded along, her coat and mane drying with each step. Her head tilted up, catching the glowing streak of the geodesic sphere flying overhead. "Did Alicorns really build this place?"
"YES." The floating object formed sharp yellow angles and collapsed once more into a ghostly golf ball.
Chewing her lip, Rainbow pressed on. "But... like... is this building something they made too?"
"YES."
"Is it..." Rainbow blinked, pausing to rub her head. "Is it my dream?"
"YES."
Rainbow frowned. "Okay... either you're full of crap or you're contradicting yourself."
The sphere flickered red. "NO."
"Okay, for realsies, how can this be both the alicorns' dream and my own?" Rainbow rolled her eyes at her own words. "Guess that's not a 'yes' or 'no' question..."
"NO."
Rainbow took a sharp right, following the line. To her left, an enormous glass pane lit up. Rainbow squinted into it, only to see a kaleidoscopic array of streaked colors and glowing imagery. Upon closer examination, she realized that it was actually a single mural being reflected at dozens of angles from the side, creating the illusion of a continuous sphere of drawn panels. It depicted what looked to be an elaborate underwater city with submarines, scuba diving ponies, and aquatic life.
"Is that something the Alicorns built as well?" Rainbow asked.
"NO."
Rainbow paused in her step, fidgeting. "...could it be something the Alicorns might build?"
"YES." The sphere flashed overhead.
"Hmmmm..." Rainbow Dash thought back to the words she had read at the front of the building. "'If we can dream it, then we can do it.'"
"YES. YES. YES."
"I think I'm starting to get it..."
Rainbow Dash trotted in a descending circle, following the queue line. To her left, she passed another glowing mural, reflected a hundred times. This time it depicted a massive urban sprawl in the center of an enormous agriculutural farmland. Ponies trotted about peacefully while a large monorail rolled through an elaborate metal station.
"...what the alicorns think in this place, they get."
"YES."
"And what they've gotten... they more or less became."
"YES."
Rainbow passed another lit mural, this time depicting what looked to be an elaborate set of metal structures floating amongst the stars. She squinted intently at pony-piloted vessels floating in and out of their docks, while equines in space suits orbited about.
"Could I... speak to one of the alicorns?"
"NO."
"I c-can't wake any of them up?"
"NO."
Rainbow's ears flattened as she glared up at the sphere. "Are they all gone?"
"YES."
The mare fidgeted, glancing left and right. At last, with a deep shudder, she muttered, "Do you know where my friend Applejack is?"
The sphere flitted about before ultimately morphing into yet another crimson star. "NO."
With a heavy sigh, Rainbow Dash trotted into the next corridor, approaching a low humming noise. "Not the answer I wanted to hear..." The geodesic sphere happily flitted after her.