Phosphor
“light-bringer”
hummingretrolate
The soft glow of an old green screen, and the paper it printed on.
If you like classic green terminals, you will feel at home here.
A green glowing screen with rounded corners, and green ruled printout paper with feed holes. Held still, as it is while you read.
The plate
By night the page is a green-black screen with a soft glow pooled in its rounded corners, faint scanlines near the edges and the ghost of old lines burned into the glass. By day it is pale green printout paper with ruled bands and feed holes down both sides. While Claude works a slow sweep line crosses the screen, the corner glow breathes and the paper feeds up a little. When the answer is ready, everything 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.
- Warming up
- Scanning
- Glowing
- Feeding paper
- Refreshing the screen
After a turn of 20 seconds or more, Phosphor 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
#e7f0e6 - Card
#eef5ed - Panel
#f4faf3 - Text
#213023 - Secondary
#3c4c3f - Muted
#556558
Dark
- Page
#19241b - Card
#1e2a21 - Panel
#233026 - Menu
#29372c - Text
#d2e8d5 - Secondary
#b2c8b5 - Muted
#96ab99
Roles
- Accent
#33a6a0 - Danger
#c86459 - Success
#5aa75e - Warning
#cc9c42 - Pro
#9076be
Measured
Standard contrast. Body text is held at 9:1 to 14:1. Here it measures 11.9:1 in light and 12.4:1 in dark. Calm accents.
| Reading | Light | Dark |
|---|---|---|
| Body text on the page | 11.9:1 | 12.4:1 |
| Muted text on the page | 5.3:1 | 6.6:1 |
| Page lightness | 95% | 25% |
| Glass | 66%, 18 pt blur | 66%, 18 pt blur |
Contrast is the WCAG ratio. Muted text is held at 4.5:1 or better. Lightness is OKLCH, where 0% is black and 100% is white.
Install
Hang Phosphor
-
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 phosphor to hang Phosphor.
/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 Phosphor
Each plate also installs by its own name, and its commands use that name, such as /phosphor still or /phosphor music.
/plugin install phosphor --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.