Virtual-Physical
Mars City

Tokamak fusion plant with a 429 m radiator field and an L0–L3 sim chain from 0-D systems code to free-boundary equilibria and neutron transport.

The buried MVDC network. Six millibars of CO₂ forbid transmission towers, the planet is too small to earth against, and ten ledgers reconciled three power scopings 1600× apart.

Starship entry corridor and belly-flop, CZ-10B net-catch recovery, two launch complexes — one launch every sol, all trajectories dynamics-baked.

SPAD atmospheric LiDAR with a closed link budget and an optical observatory whose focal plane came out of real TCAD device campaigns.

3+1 areostationary constellation and a 12 m deep-space ground station — a six-track sim loop from full-wave antennas to coding Monte Carlo.

A 100 t liquid-xenon dark-matter lab 3 km underground, a MiniPAN spectrometer riding the relay sat, and a TES focal plane watching the CMB.

Rodwell ice well, Sabatier propellant plant, regolith mine and printer, and a walk-in greenhouse dome whose 29 MN pressure-uplift ledger closes.

The compute center where the loop closes: a bigram LM on the big screen and the same algorithm as a real sky130 chip on a fabbed board in the rack.

A 20-qubit transmon machine in service mode — all six fridge stages and the shielded chip exposed — backed by a 12-sim + full-wave HFSS design ledger.

A yellow/white-bay cleanroom running three lines whose customers are all in town: sky130 digital, 65 nm analog, and double-angle Josephson junctions.

Life under 30 m of rock: the foyer hub, a residential quarter with a hydroponic wall and a real tree, a PET/CT clinic, and a World-B lounge.

Eight appliance ledgers for a 70 kPa cabin — stove, fridge, laundry, bathroom, dust, sockets, noise, make-or-import — and a walk-in show home built from them.

A city of 82 assets and no people layer: 115 people on one card, 35 beds on the rest, a dose map that is 78% blank, and a roster that says null where the cards say nothing.

Robots that navigate by sight: engine offscreen render → CIS imaging model → 5 Hz perceive-and-control loop; a humanoid with a MuJoCo-baked gait, audited ledger by ledger until its LiDAR front end reached routed silicon.

Six observatories in one sol: thermal IR, solar-blind UV, a 183 GHz water radiometer, an InGaAs SWIR camera, a 160 m radio array — and a seismometer that listens to the daily launch.

TT-1, a three-satellite laser interferometer exhibited on the surface: orbit-integrated formation breathing, 46 mm gold cubes, and a sensitivity curve that survived five known-answer gates.

The alert cluster: a weather mast that grounds the helicopter, a Timepix4 particle camera that reads storms by track shape, and SiC sentinels ringing the reactor — one storm, three depths.

A buried village claimed 7.6 mSv a year; a Geant4 ledger disagreed by five. A judge frozen before the data, a six-point cover scan, a dose-equivalent floor above the city's line — and three measurements the city found it does not have.

A RAD-measured solar storm run through the city's alarm bus: who is on the surface, which door they reach, how long the lifts and airlocks take, and what the last one in absorbs.

A coaxial scout helicopter with an 80 s baked flight loop, an electro-thermal battery ledger that grounds it below 0 °C, and a belly camera feeding the engine's sensor channel.

The densification pass: a 16-cabin earth-sheltered village on one pressure domain, a logistics depot, pink-glowing crop tunnels, and three elevated pipe corridors stitching the map together.

Heavy industry and big science, the buildings that came after the city could feed itself: a free-electron laser, a cryo-EM lab, a sulfur plant that refuted its own reason to exist, the life-support pair, and a launch campus with a crawlerway.

Carbon dioxide and well water to polyethylene by methanol-to-olefins. It can be made here, and the cost turns out to be water, not power.

The notebook page the whole city traces back to: build a world, rebuild the world inside it, hunt for the source-code cracks, ask which side is real.