Thin metal strands stitched together, forming into rough plates. Growing out from two cubic cores, the metal pushed against each itself, sending one core further skyward against the pull of gravity, and pushing the other further toward the endless void of nothing below. Each core, becoming farther and farther arpart, oozed liquid that solidified into the strands of black metal that then shot out in every cardinal direction, keeping the cubes perfectly upright. The fibers, becoming surfaces, turned and flowed, building a massive structure.
The halves ground together, sparking, pushing outwards, forming into floors and floors of jagged black metal, and eight black walls reaching up and down indefinitely, each surface covered in spontaneously revealed symbols, their meaning unknown to anyone but infinity itself.
The floors were numerous, quickly growing, and on one, past an arbitrarily generated window, down arbitrarily generated stairs, notebook in hand, ran a man. He slowed for only just a moment as his attention was drawn to the world outside the window. He saw drops of water descending through the air like rain, moving upwards past the falling tower.