Fulgur
“lightning”
electricfastneon
Neon circuit traces along the edges of a near black screen.
If you like Synthwave '84 or Cyberpunk, you will feel at home here.
Neon circuit traces, chevrons, a level meter and a perspective grid at the edges of a near black frame. Held still, as it is while you read.
The plate
A near black page with a blue-violet cast, wired at the edges. Thin neon traces run in from the sides and turn at right angles into small square pads and a chip. A row of chevrons points right at the top, a segmented level meter sits in the lower left and a fine perspective grid runs low in the lower right. By day the page is a pale cool grey and the neon is deepened, like the same city in daylight. While Claude works, short bright pulses race along the traces and the meter climbs and falls. When the answer is ready it all holds still.
While Claude works
The spinner takes one of these words in place of “Working”. When the app names the step it is on, that name stays.
- Routing
- Overclocking
- Patching in
- Jacking the grid
- Spiking
- Rerouting
After a turn of 20 seconds or more, Fulgur plays a soft chime under a second and a half long.
With /tessera music, a quiet loop of its own plays while Claude works and stops when the answer is ready. It is off until you ask for it.
Palette
Light
- Page
#f4f5fa - Card
#f8f9fc - Panel
#fbfbfd - Text
#14122a - Secondary
#2e2b48 - Muted
#46435f
Dark
- Page
#0e0c1a - Card
#131124 - Panel
#18152b - Menu
#1d1a33 - Text
#f2effe - Secondary
#c9c5e6 - Muted
#a7a3c8
Roles
- Accent
#22e3f2 - Danger
#ff2f7e - Success
#3dfa78 - Warning
#f2e33a - Pro
#a464ff
Measured
High contrast. Body text is held at 14:1 and up. Here it measures 16.8:1 in light and 17.1:1 in dark. Vivid accents.
| Reading | Light | Dark |
|---|---|---|
| Body text on the page | 16.8:1 | 17.1:1 |
| Muted text on the page | 8.7:1 | 8:1 |
| Page lightness | 97% | 16% |
| Glass | 70%, 18 pt blur | 70%, 18 pt blur |
Contrast is the WCAG ratio. Muted text is held at 7:1 or better. Lightness is OKLCH, where 0% is black and 100% is white.
Install
Hang Fulgur
-
1 In the desktop app
Click + next to the prompt box and choose Plugins. Add the marketplace btahir/tessera, then add the tessera plugin.
btahir/tessera -
2 In a terminal session
Paste this at the prompt.
/plugin install tessera --marketplace btahir/tessera -
3 Ask Claude
Send this sentence in any session.
Install the tessera plugin from the btahir/tessera marketplace on GitHub.
Then
The tessera plugin holds all twenty-five plates.
Type /tessera fulgur to hang Fulgur.
/tessera still stops the motion. Sound has three levels: /tessera quiet is silence,
/tessera sound is a chime after long turns (the default), and /tessera music adds the room's own
quiet loop while Claude works. Your choices are kept across sessions.
Only Fulgur
Each plate also installs by its own name, and its commands use that name, such as /fulgur still or /fulgur music.
/plugin install fulgur --marketplace btahir/tessera Where it shows
Themes appear in the Claude Code desktop and mobile apps. The terminal keeps its own colors. The chime plays on macOS only.