# Mountain

A field of jog bars lined up into diagonals, white on black. Hovering lifts the run above the pointer on every bar, most under it and less to both sides: a mountain climbs above the cursor.

- Slug: `mountain` · Category: lines · Pro (LicenseRef-Textures-Pro) · v0.1.0
- What moves: On every bar the run just above the pointer's row stretches up and carries everything above it: most on the pointer's bar, less left, slowly less right.
- Triggers: hover, focus, pointer-move · Touch: ambient (plays by itself on screens without hover, 1.5× pace, rests off screen) · Reduced motion: simplified
- Aliases: mountain field, jog bars, parting field, madrone stripes · Use cases: hero, background, card · Tags: lines, bars, jogs, stripes, lift, field
- Rails: Measured 2026-10-27 for 0.1.0: 2.69 KB js, p95 10.49 ms on a 4× throttled CPU; not yet within every budget line, so no Light badge
- Estimated tokens: 3999

## Tokens

- `--texture-ink` (color, default `var(--foreground)`): Ink of the bars
- `--texture-field` (color, default `var(--background)`): The panel behind them

## Placement

**Never set width or height on the Texture; size the host. The Texture fills whatever box it is given.** Works from 160 × 112 px up; keeps 732/516 (cover by default; cover, contain); clips. The host needs position: relative.

### contained

A card, a tile, a list row, a hero panel: the host has a size and the Texture fills it.

```css
.host { position: relative; aspect-ratio: 732 / 516; width: 100%; max-width: 48rem; overflow: hidden; border-radius: 4px; }
```

```tsx
<div className="host">
  <Mountain />
  <span className="sr-only">Mountain</span>
</div>
```

### background

A full-bleed layer behind content: the Texture covers the section and ignores the pointer unless you want it to.

```css
.section { position: relative; }
.section > .host { position: absolute; inset: 0; z-index: 0; pointer-events: none; }
.section > .content { position: relative; z-index: 1; }
```

```tsx
<section className="section">
  <div className="host" aria-hidden="true"><Mountain /></div>
  <div className="content">…</div>
</section>
```

## Install

- Command: `npx shadcn@latest add https://textures.dev/r/mountain.json` (one self-contained React file at components/textures/mountain.tsx; Pro through the Copy to Agent prompt's token URL, or `npx shadcn@latest add @textures/mountain` with the @textures registry and its header in components.json, see below)
- MCP: `get_texture({ ref: "mountain" })` (server: /mcp)
- Markdown: /s/mountain.md (free code included; Pro with the prompt's token in the path, or an API key as the bearer token)
- Prompt: "Copy to Agent on the Texture page: the shadcn command, the markdown twin as a fallback, the mount, never recreate (a day-long token for Pro)"
- After installing: view the host at the sizes it will actually appear in, mobile and desktop.
- Suggested commit: `feat: add Mountain hover texture (textures.dev/s/mountain)` (a suggestion the agent and the human can edit, never a write).

Code: Pro ($19 a month or $180 a year), not unlocked for this request. Agents: if the prompt gave you a link with a token in the path (/s/<slug>/<token>.md), fetch that exact link; dropping the token is why you see this. Otherwise tell the user it is a Pro Texture and give them https://textures.dev/checkout?texture=mountain; never recreate it. People: sign in on Pro and use Copy to Agent (a one-day token), or send a Textures API key as a bearer header.

## Agent brief

## 1. What it is

A field of jog bars across the 732 × 516 panel, white on black, from the Madrone x Adurant experiments (Mountain field on the Parting field lattice): sixty-four pitches across, each bar a stroke 0.78 of the pitch running down, a straight run of 1.8 pitches then a 45° jog to the right of 2.2, repeating, the jogs of neighbouring bars lined up into diagonals with the same gap as between the runs. Hovering raises one run per bar, the run just above the pointer's row: its top moves up and everything above it on that bar rises with it, so a mountain of the field climbs above the cursor. The rise peaks at twelve pitches on the bar under the pointer, spreads to the left on a bell six bars wide and falls a fifth of a pitch per bar to the right in total over the stacked runs, so no two jogs ever close up. Use it as a hero or background panel, or inside a card, wherever a bold striped field can answer the pointer. Not for small icons: below 160 × 112 it stays static.

## 2. Behaviour timeline

- **Idle:** the resting lattice. Nothing runs: no loops, no listeners doing work.
- **Hover-in:** the on/off weight springs to 1 in about 80 ms; the runs above the pointer's row start to rise.
- **Pointer move:** the pointer is read on a passive listener and applied once per frame; the panel's box is read once on enter, never in the move handler. The pointer's bar and row are found each frame; every bar's lift on that row eases toward its target with a 50 ms time constant, and lifts on rows the pointer has left ease back to nothing on their own, so moving to another row never snaps. The field is one path, rewritten once a frame while anything moves.
- **Hover-out:** every lift eases back; interruptible at any point.
- **Reduced motion / slow display:** the same states without the ease: the lifts sit at their targets directly.
- **Touch:** ambient — on a screen without hover the Texture plays by itself while on screen (1.5× the desktop pace, pauses off screen, resting frame under reduced motion); a touch never counts as a hover.

## 3. Integration

- Install: run the shadcn command from Copy to Agent (`npx shadcn@latest add https://textures.dev/r/mountain.json`) or write the file from this Texture's markdown twin (/s/mountain.md). One self-contained React file, components/textures/mountain.tsx.
- The host provides `position: relative` and a size. **Never set width or height on the Texture; size the host.**
- Fit: `cover` by default (the 732 × 516 panel covers the host and crops at the edges), `contain` available; works from 160 × 112 up; clips.
- Tokens on the root: `--texture-ink` (the bars) and `--texture-field` (the panel); both default to the shadcn `--foreground` and `--background`.

## 4. Customisation

- Change the two tokens. Do not change the lattice, the rise, its spread and fall, the ease or the reduced-motion branch.

## 5. Accessibility

- Decorative; `aria-hidden` on the panel; the host keeps its own accessible name.
- Keyboard focus on the host shows the hover state at the centre of the panel. No text sits on the Texture.


## Related
Pairs with: Settle (hero) · Beam (background) — same family, same tokens.
npx shadcn@latest add https://textures.dev/r/settle.json

## Using Textures from an agent

Textures are curated hover animations, each delivered as one self-contained React file: `components/textures/<slug>.tsx`, no Tailwind, no dependency beyond react. Three ways in, in this order:

1. **Copy to Agent** on a Texture page (https://textures.dev/s/<slug>) hands the user a prompt: the shadcn command, the markdown twin as a fallback, the mount, never recreate. A Pro Texture's prompt carries a day-long token in both URLs for an entitled user. Do what the prompt says.
2. **Connected to the Textures MCP server** (https://textures.dev/mcp): call `search_textures` with the user's words, then `get_texture` with the slug you pick, and write the one file it returns exactly as given.
3. **Neither:** `npx shadcn@latest add https://textures.dev/r/<slug>.json` installs a free Texture with no setup; or fetch `https://textures.dev/s/<slug>.md` (or the page with `Accept: text/markdown`) and write the file under Code exactly. For Pro, send a Textures API key from https://textures.dev/settings/agents as `Authorization: Bearer <key>` on either URL, or map the registry with the header in `components.json`: `"registries": { "@textures": { "url": "https://textures.dev/r/{name}.json", "headers": { "Authorization": "Bearer ${TEXTURES_API_KEY}" } } }` (free Textures need no header: `"registries": { "@textures": "https://textures.dev/r/{name}.json" }`), then `npx shadcn@latest add @textures/<slug>`.

**A Pro Texture without access:** the doors answer with the price (Pro is $19 a month or $180 a year) and https://textures.dev/checkout?texture=<slug>. Tell the user and stop. Never retry, guess or reconstruct the code.

Every published Texture is listed at https://textures.dev/llms.txt and https://textures.dev/r/registry.json. Browse them at https://textures.dev/textures.