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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link rel="icon" href="../icon.png" type="image/png" />
<title>cellauto · Reaction–Diffusion — a live observation plate</title>
<meta name="description" content="A live in-browser Gray–Scott reaction–diffusion explorer, ported from the cellauto abiogenesis sandbox. Move the F and k sliders to traverse the Pearson parameter landscape — spots, stripes, mitosis, waves, labyrinth." />
<link rel="preconnect" href="https://fonts.googleapis.com" />
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
<link href="https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,400;0,500;1,400&family=IBM+Plex+Mono:wght@400;500&display=swap" rel="stylesheet" />
<link rel="stylesheet" href="styles.css" />
</head>
<body>
<header class="plate-header">
<p class="eyebrow">P L A T E I · C E L L A U T O · M M X X V I</p>
<h1>cellauto</h1>
<p class="subtitle">a live observation of the coalescence of chemistry into pattern</p>
<hr class="hairline" />
</header>
<main>
<section class="observation">
<p class="section-label"><span class="roman">I</span> O B S E R V A T I O N</p>
<div class="canvas-frame">
<canvas id="gs-canvas" width="220" height="220" aria-label="Live Gray-Scott reaction–diffusion simulation"></canvas>
</div>
<p class="caption" id="stage-caption">
STAGE 1 · REACTION–DIFFUSION
</p>
<p class="caption-detail" id="stage-detail">
∂u/∂t = Du∇²u − uv² + F(1−u); ∂v/∂t = Dv∇²v + uv² − (F+k)v
</p>
</section>
<section class="controls">
<p class="section-label"><span class="roman">II</span> C O N F I G U R A T I O N</p>
<div class="control-row">
<label class="ctl-label" for="preset">preset</label>
<select id="preset" class="select">
<option value="">— custom —</option>
<option value="spots" selected>spots</option>
<option value="stripes">stripes</option>
<option value="mitosis">mitosis</option>
<option value="waves">waves</option>
<option value="labyrinth">labyrinth</option>
</select>
</div>
<div class="control-row">
<label class="ctl-label" for="f-slider">feed F</label>
<input id="f-slider" class="slider" type="range" min="0.0" max="0.09" step="0.001" value="0.035" />
<span class="readout" id="f-readout">0.035</span>
</div>
<div class="control-row">
<label class="ctl-label" for="k-slider">kill k</label>
<input id="k-slider" class="slider" type="range" min="0.030" max="0.075" step="0.001" value="0.065" />
<span class="readout" id="k-readout">0.065</span>
</div>
<div class="control-row buttons">
<button id="btn-play" class="btn primary">PLAY</button>
<button id="btn-stop" class="btn danger" disabled>STOP</button>
<button id="btn-step" class="btn">STEP</button>
<button id="btn-reset" class="btn">RESET</button>
</div>
</section>
<section class="marginalia">
<p class="section-label"><span class="roman">III</span> M A R G I N A L I A</p>
<p class="commentary" id="marginalia">
Self-replicating spots — Pearson (1993) <em>Science</em> 261:189 —
emerge from a four-parameter PDE Alan Turing first proposed in 1952
as the chemical basis of biological morphogenesis. The same equation,
same five regimes, run live in your browser.
</p>
</section>
<section class="gallery">
<p class="section-label"><span class="roman">IV</span> T H E R E S T O F T H E S T O R Y</p>
<p class="caption-detail">
The other ten origin-of-life stages — soup, alkaline vents,
autocatalytic sets, homochirality, the RNA world, the genetic code,
coacervates, vesicles, protocell selection, and LUCA distillation —
run in the full Python build. Below: museum plates rendered from
each stage.
</p>
<div class="gallery-grid">
<figure><img src="../generated/stage0_soup.png" alt="Stage 0 — primordial soup" /><figcaption>0 · PRIMORDIAL SOUP</figcaption></figure>
<figure><img src="../generated/stage1_reaction_diffusion.png" alt="Stage 1 — reaction–diffusion" /><figcaption>1 · REACTION–DIFFUSION</figcaption></figure>
<figure><img src="../generated/stage2_autocatalytic.png" alt="Stage 2 — autocatalytic sets" /><figcaption>2 · AUTOCATALYTIC SETS</figcaption></figure>
<figure><img src="../generated/stage3_vesicles.png" alt="Stage 3 — vesicles" /><figcaption>3 · VESICLE FORMATION</figcaption></figure>
<figure><img src="../generated/stage4_selection.png" alt="Stage 4 — protocell selection" /><figcaption>4 · PROTOCELL SELECTION</figcaption></figure>
<figure><img src="../generated/pipeline_poster.png" alt="Pipeline poster — chemistry into life" /><figcaption>Ω · CHEMISTRY INTO LIFE</figcaption></figure>
</div>
</section>
</main>
<footer>
<p class="footer-text">
cellauto — abiogenesis sandbox · MIT · source on
<a href="https://github.com/rizzleroc/CellAutomata">GitHub</a>
· twelve scientifically-grounded stages in the desktop build
</p>
</footer>
<script src="presets.js"></script>
<script src="viridis.js"></script>
<script src="sim.js"></script>
</body>
</html>