What if underground libraries began orbiting one another like moons

Deep beneath a city, vast underground libraries lift free and begin orbiting one another like a miniature system of moons. Stable paths, changing shadows, drifting debris, and layered depth make the orbital motion believable. Endless shelves, stone arches, ladders, and warm lamps recede into darkness. Join the orbit of the nearest form and reveal the complete system turning around its center.