I woke up and the world was wrong.

Not broken. Not destroyed. Wrong, in the way that a photograph is wrong when someone has edited one face out of the group and you don't notice until you've looked at it too long. The mountains were in the wrong places. The sky was the wrong color. And everything was small.

I was the one who was wrong.

My name is Jack Harlowen. I am two meters and eleven centimeters tall. I weigh one hundred and eighty kilograms. I am, by every measurable standard, a large man. But here, in this place that used to be the Rocky Mountains and is now something else entirely, I am a giant. I am a monster. I am a ghost.

The first thing I saw when I opened my eyes was a face. It was pressed against the glass of the hibernation chamber — not my face. A different face. Small. Maybe three centimeters across. Two dark eyes, a tiny mouth, fine features that would have been beautiful on a human face the size of a fingernail.

The tiny face was looking at me the way I might look at a dinosaur bone in a museum. With curiosity. With awe. With the cautious respect one reserves for something extinct.

I raised my hand. The tiny face watched my hand — a hand the size of a dinner plate to this creature — rise slowly toward the glass. I pressed my palm against the inside of the chamber. To the being outside, it must have looked like a boulder pressing against a window.

The glass fogged where my skin touched it. I could feel the cold. I could feel the hum of the hibernation facility's backup systems, still running after ten thousand years on some autonomous power source. I could feel the ache in my muscles, the stiffness in my joints, the thick cotton taste of ten millennia of sleep in my mouth.

And I could feel, with a certainty that was not comfort and was not terror but something between the two, that I was the last.

Last macro-human. Last giant. Last of the era before the shrinking.

The door to the hibernation facility opened. Not mechanically — someone had opened it. A group of tiny figures stood in the doorway. Maybe twenty of them, no taller than my thumb. They wore suits of some translucent material, and their faces were visible through the faceplates. Their eyes were wide. Their expressions ranged from wonder to fear to something I could only describe as grief.

One of them stepped forward. A woman, I thought, from the shape of her face. She was maybe four centimeters tall. She raised her hand — a hand with five tiny fingers, a hand that looked exactly like mine except for the scale — and waved.

I waved back.

My hand was bigger than her entire body.

She did not flinch. She stood there, four centimeters of courage, and she watched my hand rise and fall in a gesture that was meant to be friendly and felt, I realized with a pang, like a natural disaster.

Her name, I learned, was Mina. Dr. Mina Vasquez, biologist at the New Earth Research Station, which was built — I discovered over the following weeks — into the eastern face of what used to be Mount Elbert and is now, to the micro-humans, a cliff face three hundred meters high.

Mina explained, in a voice so high-pitched I could barely hear it, the history of the last ten thousand years. The asteroid impact of 2143. The atmospheric collapse. The emergency genetic modification program that shrunk surviving humanity to one millimeter in size. The rebuilding. The glass-domed cities built into the cracks of rocks. The art. The philosophy. The science. The quiet, fragile civilization that had grown up in the shadow of giants.

"You are the last macro-human," Mina said. She spoke slowly, enunciating each syllable, and I heard her voice through a conversion device that lowered the frequency to a range my ears could process. It made her sound like a cello, but the words were clear. "We do not know how you survived. We do not know why you woke up. But you are here, and we are here, and the question is — what happens next?"

I walked the world. I walked from the Rocky Mountains to what had been Denver and was now a shallow depression filled with crystalline structures that glittered in the sunlight like scattered diamonds. I walked to the Kansas Plains, where the micro-humans had built their largest city: a sprawling complex of transparent domes connected by bridges no wider than a thread, suspended between rock formations that to me were boulders and to them were mountains.

I saw their art. Sculptures made from the petals of flowers — flowers that to me were trees. Paintings on surfaces no bigger than my fingernail, created with pigments ground from minerals. Music played on instruments made from seed pods and spider silk — high, delicate, heartbreaking.

It was the most beautiful thing I had ever seen.

And it made me obsolete.

The micro-humans had not just survived. They had thrived. They had built a civilization that was more refined, more delicate, more beautiful than anything the macro-world had ever produced. Their cities were not built on the land — they were built into it, in the cracks and crevices that macro-humans would never have noticed. They had learned to live at a scale that made the macro-world feel clumsy and crude and loud.

I was loud. My footsteps shook the ground. My breathing stirred wind. When I picked up a grain of sand, it was a boulder to them. When I sat down, I cast a shadow that covered their eastern district for three hours.

I was a walking catastrophe. Not because I was malicious. Because I existed.

The Council of the New Earth summoned me six weeks after I woke up. They were twelve micro-humans, seated in a chamber carved into the base of what used to be a granite outcrop and is now a room the size of a shoebox. They wore robes of woven plant fiber. Their faces were solemn. Their eyes were sharp.

Their leader, a man named Eliasz Korbel, spoke for them.

"Jack Harlowen," he said, and his voice through the conversion device sounded like a child singing in a cathedral — tiny and resonant and impossibly old. "You are a relic. A living fossil. A reminder of an era that was a mistake."

I sat very still. The ground vibrated beneath me. I stopped breathing for a moment and felt terrible about it.

"The Macro Era," Eliasz continued, "was an age of destruction. Your kind — our kind, ancestrally — consumed the world. You burned the forests. You poisoned the rivers. You heated the atmosphere until the asteroid was merely the coup de grace. The shrinking was not a choice. It was a correction."

I nodded. It was true.

"The Council has deliberated," Eliasz said. "We have two proposals for you. First: you may submit to memory modification. We can erase your memories of the Macro Era. You will forget the world you came from. You will learn to live at our scale. You will be one of us."

I looked at him. "And the second?"

"The second is that you leave. Build a spacecraft. Go into space. Because you do not belong here, Jack Harlowen. You never did. You are a ghost. And ghosts do not belong in the houses of the living."

I thought about that for a long time. I thought about Mina, who had looked at me with wonder and not fear. I thought about the art in the glass domes, the music made from spider silk, the philosophy of a people who had learned, in ten thousand years, how to live lightly on the Earth.

I thought about the macro-world. The world of forests and oceans and mountains the size of gods. The world where a grain of sand was a pebble and a pebble was a boulder and a boulder was a hill. The world where I could walk without thinking about the vibration of my footsteps, where I could speak without worrying that my voice would shatter windows, where I could exist without being a disaster.

That world was gone. And the people who built it were gone. And I was the last one who remembered it.

I went back to the hibernation facility. I worked for three months, using parts from the decommissioned hibernation chambers and the autonomous maintenance robots that still crawled through the facility's corridors. I built a spacecraft. It was small — maybe six meters long, cramped and basic, equipped with life support for one, with a fusion drive capable of reaching low solar orbit but nothing more.

It was enough.

On the morning I launched, Mina came to the launch site. She stood on a rock the size of a sofa to me, and she was four centimeters tall, and she was the bravest person I had ever met.

"Will you come back?" she asked.

"No," I said. "I don't think I will."

"Why not?"

I looked at her. I looked at the glass-domed city behind her, glittering in the morning light like a cluster of dewdrops. I looked at the mountains that were now pebbles and the oceans that were now puddles and the sky that was still the same infinite blue it had always been.

"Because I'm the last one," I said. "And the last one's job is to leave."

I climbed into the spacecraft. I sealed the hatch. I started the engine. The vibration was gentle — to me, it was a purr; to her, I hoped it was nothing more than a distant rumble.

As I rose above the Rocky Mountains — now a range of pebbles and gravel — I looked down. Mina was a speck. The glass-domed city was a spark. The Earth was a ball, blue and green and impossibly small.

I pulled the throttle forward. The fusion drive ignited. And I left.

Behind me, the micro-humans waved at the sky with their tiny hands, and above me, the stars waited, cold and distant and infinitely patient, and I flew into them — the last macro-human, the last giant, the last pioneer — alone, and free, and exactly where I belonged.