Narew

One HTML file holding a three.js world: a single property in Gzowo on the Narew, the house on it, a carport, the meadow and the river below. The terrain is not invented. Elevations come from a Copernicus digital elevation model, and the river channel, the oxbow lake and the drainage ditches are polylines traced from OpenStreetMap and carved into the heightfield, so the shape of the water matches the real place. The ground is also editable: an excavator and a shovel cut real holes into a one-metre mesh, with flat bottoms you can climb down into, and the coarse grid underneath is pushed out of the way so the two never fight.

The water carries traffic. Three kayaks lie on the bank and a jet ski is moored in the channel; the jet ski leaves expanding rings behind it, and those rings are not decoration — they are read back by the kayaks, which lift and pitch when a wake reaches them. Kayak hulls refuse to leave water deeper than thirty centimetres, so the river keeps you in it.

The television in the glass house is a canvas texture redrawn in place: live weather for Gzowo from open-meteo, short films drawn frame by frame, a shelf of YouTube links behind a password, and NAREBLOX, eleven small games. Nine are drawn on that canvas; two are separate three.js scenes rendered to a texture, so the set displays real 3D from inside a 3D world. Every one of the eleven is multiplayer. Facing the set there is now a sofa with a man in swimming trunks sitting on it, dripping, phone in hand — sit down and the view cuts to his screen, which plays a vertical feed of one person's videos and nothing else.

The place is populated. A neighbour walks a fixed round of the property and stops to talk when you stand near him; a sounder of ten wild boar roots through the meadow and bolts as a group when you get within eleven metres; five raccoons dance in a ring around the campfire and speed up when it is lit. A keypad by the door takes a two-digit code, and the right one brings a man on horseback across the meadow with a cigarette in his mouth. Their clothes are photographs of linen, cloth and leather from CC0 libraries, cut to 512 pixels, with code-drawn weave as the fallback if the folder is missing.

Around that: characters are GLTF models with blended idle, walk and run clips, multiplayer runs peer to peer over PeerJS with the host relaying positions, and wind is patched into existing materials by swapping their shader, so grass and tree crowns bend from the base with a phase taken from world position. The interface is in Polish, the way it was written.