"There were infinite lights, the luminous walls and ceilings that seemed to drip cool, even phosphorescence; the flashing advertisements screaming for attention; the harsh, steady gleam of the 'lightworms' that directed:
THIS WAY TO JERSEY SECTIONS, FOLLOW ARROWS TO EAST RIVER SHUTTLE, UPPER LEVEL FOR ALL WAYS TI LONG ISLAND SECTIONS.
Most of all, there was the noise that was inseparable from life. The sound of millions talking, laughing, coughing, calling, humming, breathing."
In "The Caves of Steel" by Isaac Asimov
Set 2,000 years in the future, "The Caves of Steel" shows us contrasting pictures of Earth and the Outer Worlds - colonized planets throughout the Galaxy. Although the inhabitants of the Outer Worlds trace their origins to Earth, they are separated from it by much more than mere distance, now calling themselves Spacers and ruling the decaying mother planet as benevolent despots. In his earlier novels, Asimov mastered the translation of speech into its written equivalent; but to recreate the speech of a human being is a problem every novelist faces.
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