Plugged in a real API key and took the globe on a five-city tour — Tokyo, New York, Reykjavik, São Paulo, LA — and every city looked completely different. Tokyo at night: dense grey cityscape, blue glass tint, snow swirling inside the dome. NYC in cloudy daylight: brownstone-height buildings with warm tones. Reykjavik at 9°C with overcast: squat colorful buildings reflecting actual Icelandic architecture. São Paulo during a thunderstorm: rain particles, dark moody sky, green parks breaking up a high-rise grid. LA at 25° and partly cloudy: sandy ground, blue and tan buildings, daytime sky. Gemini picked location-appropriate colors and building heights every time without any prompt engineering — the structured JSON schema forced well-formed output and the grounding step pulled real weather data with source citations.