DeepSeek V4.1 Flash built this living miniature island in three.js from one prompt. 3,100 lines, no assets, about $1 (live demo)

Live demo: tiny-harbor-deepseek.vercel.app I wrote one detailed prompt and let DeepSeek V4.1 Flash (max effort) build it in AgenC. Everything you see is procedural: no 3D models, textures or images, only three.js loaded from a CDN. What it built: - A small island with a cliff, a beach, a harbor and a pier - Three sailboats that sail around the island and dock - A windmill, a lighthouse and twelve houses with chimney smoke - A 60-second day and night cycle: misty dawn, sunset as the windows light up one by one, then night with stars, a moon, fireflies and the lighthouse beam sweeping the sea - Rain and snow (the snow slowly whitens the roofs) - Gulls, and a fish that jumps now and then - Tilt-shift depth of field, so it looks like a real miniature - Click a boat, house, windmill or the lighthouse and the camera glides to it - Optional procedural sound: waves, wind and a distant harbor bell The code is about 3,100 lines across 15 JavaScript files and one HTML page. API cost was about $1 at DeepSeek's off-peak prices. I didn't edit the code; the demo is what it wrote. I'll put the full prompt in the first comment. Disclosure: I build AgenC ( github.com/tetsuo-ai/agenc-core ), and I'm a DeepSeek fan.