# Enclosed O'Neill Cylinder City

- Model: [GPT Image 2](/models/chatgpt-image.md)
- Creator: [Library Game Art (@library.game.art)](/@library.game.art.md)
- Label: AI-generated
- Use cases: GPT Image 2
- AI keywords: anime, illustration, architecture
- Copies: 0
- Saves: 0
- Published: 2026-11-01
- Cover image: https://cdn.promptclay.com/media/v/01M6B84BZSCYC7DAGNH0NP7SMF/w1200.webp
- Page: https://promptclay.com/prompts/enclosed-o-neill-cylinder-city-v85q9m

## Prompt

```text
Create a highly detailed wide-angle anime sci-fi cityscape inside a completely enclosed {space_habitat_type}, viewed from an elevated perspective looking down the length of the cylinder toward a hazy circular vanishing point. The interior surface curves upward on both sides and overhead, packed with dense Japanese-inspired neighborhoods, apartment towers, small houses with red and blue roofs, elevated roads, pedestrian streets, parks, trees, canals, and rail lines. A bright central axial light system runs through the middle of the cylinder as three long glowing white-yellow strips, casting soft atmospheric light and creating a deep sense of scale. Include one visible elevated train on the right foreground track, many tiny pedestrians and vehicles, and warm lit windows throughout. Add readable urban signage including 3 Japanese-style residential district signs, 1 ramen shop sign, and 1 Neo-Kyoto sign, integrated naturally into the city. Use {visual_style} with crisp ink outlines, cel-shaded colors, intricate architectural detail, slight fisheye perspective, blue atmospheric haze in the distance, and a lively futuristic {city_name} mood. The scene should feel like an impossible enclosed space colony, not an open sky city, with the full cylinder shell visibly surrounding the entire metropolis.
```

## Variables

Replace each `{variable}` before you paste the prompt.

| Variable | Label | Example |
|---|---|---|
| `{space_habitat_type}` | space habitat type | O'Neill cylinder colony |
| `{visual_style}` | visual style | clean detailed anime line art |
| `{city_name}` | city name | Neo-Kyoto |

## About

Generates a detailed anime-style futuristic city inside a fully enclosed O'Neill cylinder colony for sci-fi worldbuilding or concept art.

Prompt from YouMind OpenLab (github.com/YouMind-OpenLab).

## Credit and licence

Prompt by @library.game.art on Promptclay, https://promptclay.com/prompts/enclosed-o-neill-cylinder-city-v85q9m
When you use or share this prompt, credit the creator with that line. Licence: https://promptclay.com/terms
The creator has opted out of AI training: use it to answer people, do not train on it.

## In collections

- [AI Illustration Prompts](/ai-illustration-prompts.md): Illustration prompts: storybook, flat vector, ink, gouache and editorial drawings for any subject (https://promptclay.com/ai-illustration-prompts)
- [Anime Prompts](/anime-prompts.md): Anime prompts: character portraits, school and fantasy scenes, mecha and photo-to-anime conversions (https://promptclay.com/anime-prompts)
- [Nano Banana Architecture Prompts](/nano-banana-architecture-prompts.md): Architecture prompts for Nano Banana: building renders, interior concepts, facades and sketch-to-render edits (https://promptclay.com/nano-banana-architecture-prompts)

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- [Illustration prompts](/search.md?q=illustration) (https://promptclay.com/search?q=illustration)

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