# Humming Top

> Gyre pack: a humming top, a round shell of spun brass on a point with a slotted band of chrome round its shoulder and a twisted pump rod topped with a walnut knob. Each push of the knob screws the rod down and spins the shell faster, its slots blurring into a dark band; when it slows it gets three quick pumps. Tap to pump it, drag across to spin it. Raymarched in WebGL.

- Slug: `gyre-hum`
- Category: [Asset packs](https://www.assembli.design/category/asset-packs.md)
- Subcategory: [Gyre](https://www.assembli.design/category/asset-packs/gyre.md) (`gyre`)
- Type: component
- Tags: 3d, webgl, raymarching, physics, spinning-top, metal, motion-blur, humming-top, pump, toy, vintage, brass
- npm dependencies: none
- shadcn/ui dependencies: none
- Live preview: https://www.assembli.design/preview/gyre-hum
- Page: https://www.assembli.design/components/gyre-hum

![Humming Top preview](https://www.assembli.design/thumbnails/gyre-hum-light.png)

## Props

Other props pass through to the root element.

| Prop | Type | Default | Description |
| --- | --- | --- | --- |
| `palette` | `GyrePalette` |  | A preset palette. Every piece in the pack reads the same colors. |
| `colors` | `Partial<GyreColors>` |  | Override any color of the palette, as any CSS color. |
| `studio` | `string` |  | The table the piece stands on, as any CSS color: what its metal reflects below the horizon. Match it to the page behind. By default it's a warm paper white, or near black on dark surfaces. |
| `light` | `GyreLight` |  | How the set is lit. Changing it crossfades. |
| `shutter` | `number` |  | Shutter speed in seconds: how far the spin blurs in each frame. 1/60 shows spokes as a veil; 0 freezes them sharp, as if lit by a strobe. |
| `speed` | `number` |  | Playback speed. 0 holds the moment; reduced motion always holds it. |
| `interactive` | `boolean` |  | Drag across a piece to spin it up, tap to knock it (or to spin it again once it's down). |
| `poke` | `number` |  | Change this value to knock it on cue. |
| `shadow` | `boolean` |  | The shade the piece casts and the window's bars on the table. |
| `surface` | `"auto" \| "light" \| "dark"` |  | What the piece sits on. "auto" follows the page theme; set "light" or "dark" when it sits on its own backdrop. |
| `rotate` | `[number, number]` |  | Move the camera, in degrees: [higher, round to the right]. |
| `onRpm` | `(rpm: number) => void` |  | Called about ten times a second with the spin in revolutions per minute, for a readout. |

## Install

One-time setup (needs a subscription):

1. Add the registry to the project's `components.json`: `{"@assembli":{"url":"https://www.assembli.design/r/{name}.json","headers":{"Authorization":"Bearer ${ASSEMBLI_API_KEY}"}}}` (merge into `"registries"`).
2. Put an API key from https://www.assembli.design/account in `.env.local` as `ASSEMBLI_API_KEY=asm_…`.

Then install with the shadcn CLI (writes `components/gyre-hum/gyre-hum.tsx` and installs dependencies):

```bash
npx shadcn@latest add @assembli/gyre-hum
```

Registry item JSON: https://www.assembli.design/r/gyre-hum.json (send `Authorization: Bearer <api key>`)

## Code

> Component source needs an Assembli subscription ($12/month or $96/year) and an API key sent as `Authorization: Bearer <key>`. To get one without copying anything, POST https://www.assembli.design/api/agent/login (or call the MCP tool connect_account), show the user the link it returns, and poll https://www.assembli.design/api/agent/token for the key. Or subscribe at https://www.assembli.design/pricing and create a key at https://www.assembli.design/account.