# Aqua (アクア)

> Mac OS X's lickable design language: gel-gloss buttons, pinstripes, deep shadows and the genie effect staging digital parts as touchable objects — defining 2000s UI at large.

- IndexStyle No.439 — https://indexstyle.org/styles/aqua
- Kind: Style · Family: Apple UI · Era: 2000–2014
- Mood: Futurism, Play, Intimacy
- Color cues: #e9e6dd / #67635d / #171615 (cues taken from reference works, not a fixed palette)

## Defining characteristics

- Gel-gloss buttons
- Pinstriped grounds
- Deep drop shadows
- Metaphors of water and light

## Best used for

- Comparing primary sources and canonical works
- Extracting principles that transfer to other media

## Research method

This entry records a historical style; derive the treatment from its sources rather than a fixed recipe:

- Observe the letters, signs and scale of reference works
- Extract the one structure that governs gaze and information
- Verify the materials and behaviors specific to era, region and process

## What to avoid

Don't reduce it to surface signs. Verify the context of era, region, technology and makers.

## Application checklist

Before calling a piece an application of this style, check it against the defining characteristics:

- [ ] Gel-gloss buttons
- [ ] Pinstriped grounds
- [ ] Deep drop shadows
- [ ] Metaphors of water and light
- [ ] At least one reference work below has been studied directly
- [ ] The caution above ("What to avoid") has been addressed

## Related styles

- **Skeuomorphism (スキューモーフィズム)** — Borrows cues from real materials and tools to make unknown interactions understandable. → https://indexstyle.org/styles/skeuomorphism
- **Liquid Glass (リキッドガラス)** — Unifies the floating control and navigation layer as a fluid glass material that refracts and adapts to the content beneath. → https://indexstyle.org/styles/liquid-glass

## Further study

- the Mac OS X Public Beta, 2000
- Jobs's 'lick it' line
- the return in Liquid Glass

## Reference works

- GUIdebook — Graphical User Interface gallery — https://guidebookgallery.org/

## AI interpretation

An AI-generated interpretation image exists for browsing convenience only — it is not a reference work: https://indexstyle.org/ai/aqua.jpg

## Source of record

- GUIdebook — Graphical User Interface gallery — https://guidebookgallery.org/

## Machine surfaces

- JSON: https://indexstyle.org/api/styles/aqua
- Image-generation prompt (legally clean): https://indexstyle.org/styles/aqua/prompt.txt
- MCP: https://indexstyle.org/mcp (tools: search_styles, get_style, compose_styles; prompts: image-prompt, apply-style)

## 日本語

Mac OS Xが提示した「舐めたくなるボタン」のデザイン言語。ゼリー状の光沢、ピンストライプ、深い影とジニーエフェクトが、デジタル部品を触れる物体として演出し、2000年代のUI全体を規定した。

特徴: ゼリー状の光沢ボタン／ピンストライプの地／深いドロップシャドウ／水と光の隠喩
注意: 表面的な記号へ還元せず、時代・地域・技術・制作主体の文脈を確認する。