Create a square t-shirt graphic design with the following concept:

Title: Nocturnal Metamorphosis
Slogan: Embrace the Dark Flutter
Visual style: gritty spray paint art with duotone gunmetal hues
Mood: underground feral with a hint of eerie mysticism
Core concept prompt: Spray paint style illustration of a mirrored tarot card frame containing a symmetrical sun and moon orb surrounded by a swirling swarm of butterflies. The design uses a duotone palette of gunmetal shades with collage elements and repeated butterfly icons. Brutalist bold condensed typography with distorted baseline spells out 'Embrace the Dark Flutter' at the bottom. The overall composition feels feral, underground, and haunting, with a gritty texture and medium complexity.

Hard constraints:
- Keep composition centered and shirt-print friendly.
- Use high-contrast, clear forms suitable for print.
- Any text must be large and easily readable.
- Exclude all forbidden elements: realistic faces, bright neon colors, corporate logos, political symbols, small illegible text
- Do not include real brand names/logos, celebrity likenesses, copyrighted characters, political campaign slogans, hateful content, or explicit content.

Output a clean standalone design graphic, no mockup, no watermark, no background scene.

Create a square t-shirt graphic design with the following concept:

Title: Nocturnal Metamorphosis
Slogan: Embrace the Dark Flutter
Visual style: gritty spray paint art with duotone gunmetal hues
Mood: underground feral with a hint of eerie mysticism
Core concept prompt: Spray paint style illustration of a mirrored tarot card frame containing a symmetrical sun and moon orb surrounded by a swirling swarm of butterflies. The design uses a duotone palette of gunmetal shades with collage elements and repeated butterfly icons. Brutalist bold condensed typography with distorted baseline spells out 'Embrace the Dark Flutter' at the bottom. The overall composition feels feral, underground, and haunting, with a gritty texture and medium complexity.

Hard constraints:
- Keep composition centered and shirt-print friendly.
- Use high-contrast, clear forms suitable for print.
- Any text must be large and easily readable.
- Exclude all forbidden elements: realistic faces, bright neon colors, corporate logos, political symbols, small illegible text
- Do not include real brand names/logos, celebrity likenesses, copyrighted characters, political campaign slogans, hateful content, or explicit content.

Output a clean standalone design graphic, no mockup, no watermark, no background scene.