Prompt
Why your O'Neill cylinder keeps failing in Midjourney
You're asking Midjourney to generate an O'Neill cylinder.
That's the mistake.
Never prompt the name of the structure.
Prompt the geometry that defines it, then the physical description that emerges from that geometry.
The model can only build what you've actually described.
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FAQ
- Where do I use this Midjourney prompt?
- Paste it into the imagine bar on midjourney.com or the /imagine command in Discord. If the prompt includes parameters like --ar or --sref, copy those too — they set the aspect ratio and style.
- What do the --sref and --ar values mean?
- --ar sets the aspect ratio (e.g. --ar 2:3), and --sref points at a saved style so any subject rendered with that code inherits the look. Keep them to reproduce this image's framing and style.
- Is Midjourney free?
- Midjourney is a paid subscription with no permanent free tier, used via Discord or the website. Copying and adapting this prompt is free.
