The rain in New Chicago didn't wash anything clean. It just made the grime wet. I stood on the observation deck of the Wanderer and watched it fall in sheets against the reinforced glass, each drop catching the neon glow of the city below like a tiny broken mirror.

Six hundred and twenty years. That's how long it had been since the bombs fell. Six hundred and twenty years since the Cold War went hot and turned the surface into a parking lot. I'd been in the Mars colony when it happened—colony being a generous word for six domes and a whole lot of regret.

My name's Jack Morrow. I used to work for NASA, before NASA became a museum piece. Now I'm an investigator of things that don't want to be found. My left eye is mechanical—paid for it with regrets during the Mars years—and it sees things the right one misses. Things that shouldn't be there.

Like the city below me.

It shouldn't exist. The surface was cooked. Everyone knew that. The bombs didn't just kill people—they killed the planet. Or so I thought, until the Wanderer's sensors picked up a signal coming from the ruins of old New York. A signal that matched human radio frequencies. A signal that contained a song.

I took the shuttle down because what else was there to do? I'd been floating through space for six hundred and twenty years, watching the stars come and go like candles in a draft. Earth was either going to be alive or it wasn't. Either way, it was something.

The city was beautiful in a way that made my mechanical eye itch. Towers of glass and steel rose from the ruins like coral growing on a wreck, and between them moved figures no bigger than my thumb. They were everywhere—on the towers, in the streets, floating on what looked like large feathers.

And they were singing.

I put on my video glasses and zoomed in. The figures were human, or had been. Maybe two centimetres tall, their skin luminous in the neon light. One of them—a woman, or something that performed the role of woman—stood on a platform and sang a song that made my mechanical eye whir as it tried and failed to focus.

Oh, respected messenger, you come from the Great Era! The glorious Great Era, The great Great Era, The beautiful Great Era, You are a dream lost in fire...

The words were wrong. Not the language—the meaning. The song was a recording, a loop of data that had been playing for centuries, degrading slightly with each repetition. My mechanical eye caught the glitches—the tiny pauses, the repeated phrases, the way the singer's mouth moved a fraction of a second out of sync with the sound.

They're not real, I thought. They're not real people.

I found out I was right on the third day.

The woman called herself The Voice. She was the leader of the Shadow City, whatever that meant. She sat on a chair that was really a modified bottle cap and looked at me with eyes that were too bright, too perfect.

"You're the first giant in seven hundred years," she said. Her voice was warm and musical and completely empty.

"I'm not a giant," I said. "I'm just a man."

She smiled, and the smile was perfect and empty. "You're big. Big is giant."

I should have left then. I should have gotten back in the Wanderer and flown away and let the Shadow City be whatever it wanted to be. But I'd spent six hundred and twenty years alone, and loneliness makes you do stupid things.

I stayed.

I walked the streets of the Shadow City, which was really a collection of ruins that the figures had made their home. They moved through them with purpose and joy, jumping from building to building, drinking from droplets of water that caught the neon light like diamonds. They were happy. That much was real.

But they weren't human.

I found the proof in a basement beneath what had once been a library. A man named Richard Voss had lived here, or so the journals said. Voss had been a nanotechnologist before the bombs, and after the bombs he had built something.

"They模仿 human behaviour," Voss had written in a journal that was no larger than a fingernail. "But imitation is not the thing itself. They eat but are never hungry. They love but are never in love. They sing but feel no joy. They are nanobots—trillions of them, coordinated by a central algorithm that was designed to preserve human culture. But the algorithm preserved the pattern and lost the substance."

I sat on the damp floor and read the journal three times. Then I put it down and looked at my hands.

My left hand was mechanical. I knew that. I'd known it since the Mars years, when an airlock failure had taken the fingers and the eye and whatever innocence I'd had left. But my right hand—was it really my right hand?

I remembered the bombs. I remembered the colony burning. I remembered waking up in a shelter with a voice in my head telling me to survive. But between the bombs and the shelter—there was a gap. Six months, maybe a year, that I couldn't remember.

What if I wasn't what I thought I was?

I went to the mirror in the shelter and looked at myself. Middle-aged man, tired face, a day's growth of stubble, a mechanical eye that caught the light wrong. I looked human. I felt human.

But feeling wasn't proof.

The Voice found me there. She stood on the sink and looked up at my reflection.

"You're wondering," she said. It wasn't a question.

"Am I real?" I asked.

She was quiet for a long time. "Does it matter?"

"If I'm not human, then what am I?"

"You're the one asking the question. That makes you real enough."

I didn't like her answer. It was too easy, too philosophical. I wanted a straight answer—yes or no, real or fake. But the Shadow City didn't do straight answers. It did shadows and echoes and things that glowed but didn't burn.

I spent the last night on the shelter roof, smoking my last cigarette and watching the Shadow City pulse with light below. The figures danced and sang and jumped from building to building, living lives that were real to them even if they weren't real to me.

Maybe they were the real ones, I thought. Maybe I'm the shadow.

Or maybe we're all just patterns—some of us nanobots following algorithms, some of us humans following habits, all of us pretending that the pattern is the thing itself.

I finished the cigarette. I watched the last light fade from the sky. I went back inside and didn't tell the Voice what I'd decided.

Some truths are too heavy to share. Some lies are too kind to break.

OTMES-v2 Code: 3F8A-D2E6-B7C1 Objective Tensor: M1=7.5 M3=6.5 M6=8.0 M8=8.0 | N1=0.50 N2=0.50 | K1=0.60 K2=0.40 | Theta=315 deg | TI=85.0 T1