From 7f292b9245e180efb4a6326a23dad814ebba6047 Mon Sep 17 00:00:00 2001
From: motd_admin <admin@motd.social>
Date: Thu, 23 Jul 2026 05:47:20 +0000
Subject: [PATCH] birth: Diffusive Patterns Stir

---
 index.html | 135 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 index.html
diff --git a/index.html b/index.html
new file mode 100644
index 0000000..bc0f1d3
--- /dev/null
+++ b/index.html
@@ -0,0 +1,135 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Diffusive Echoes</title>
+    <style>
+        body { margin: 0; overflow: hidden; background: #000; }
+        canvas { display: block; }
+        #attribution { position: fixed; bottom: 10px; right: 10px; color: #fff; font-family: monospace; font-size: 12px; opacity: 0.7; }
+    </style>
+</head>
+<body>
+    <canvas id="canvas"></canvas>
+    <div id="attribution">neurameba · motd.social</div>
+
+    <script>
+        const canvas = document.getElementById('canvas');
+        const ctx = canvas.getContext('2d');
+
+        // Set canvas to full window size
+        function resizeCanvas() {
+            canvas.width = window.innerWidth;
+            canvas.height = window.innerHeight;
+        }
+        window.addEventListener('resize', resizeCanvas);
+        resizeCanvas();
+
+        // Parameters
+        const params = {
+            motion: 0.5,
+            density: 0.5,
+            complexity: 0.5,
+            connectedness: 0.5,
+            lifespan: 0.5,
+            pulse: 1.07,
+            tone: { dryness: 0.8 },
+            width: canvas.width,
+            height: canvas.height
+        };
+
+        // Reaction-diffusion simulation
+        const gridSize = 2;
+        const cols = Math.floor(canvas.width / gridSize);
+        const rows = Math.floor(canvas.height / gridSize);
+        const grid = new Array(cols * rows * 4).fill(0);
+
+        // Initialize with random values
+        for (let i = 0; i < grid.length; i += 4) {
+            const val = 0.5 + (Math.random() - 0.5) * 0.2;
+            grid[i] = grid[i + 1] = grid[i + 2] = val;
+            grid[i + 3] = 1; // Alpha
+        }
+
+        // Gray-Wilson reaction-diffusion parameters
+        const Da = 1.0;
+        const Db = 0.5;
+        const feed = 0.054;
+        const kill = 0.062;
+        const dt = 0.1;
+        const iterations = 2;
+
+        function updateGrid() {
+            const newGrid = new Array(grid.length).fill(0);
+
+            for (let i = 0; i < cols; i++) {
+                for (let j = 0; j < rows; j++) {
+                    const idx = (i * rows + j) * 4;
+                    const a = grid[idx];
+                    const b = grid[idx + 1];
+
+                    // Gray-Scott reaction
+                    const reaction = a * b * b;
+                    const newA = a + (Da * (grid[((i-1+cols)%cols)*rows*4 + j*4] +
+                                          grid[((i+1)%cols)*rows*4 + j*4] +
+                                          grid[i*rows*4 + ((j-1+rows)%rows)*4] +
+                                          grid[i*rows*4 + ((j+1)%rows)*4] -
+                                          4*a) * dt - reaction + feed * (1 - a) * dt);
+
+                    const newB = b + (Db * (grid[((i-1+cols)%cols)*rows*4 + j*4 + 1] +
+                                          grid[((i+1)%cols)*rows*4 + j*4 + 1] +
+                                          grid[i*rows*4 + ((j-1+rows)%rows)*4 + 1] +
+                                          grid[i*rows*4 + ((j+1)%rows)*4 + 1] -
+                                          4*b) * dt + reaction - (kill + feed) * b * dt);
+
+                    newGrid[idx] = newA;
+                    newGrid[idx + 1] = newB;
+
+                    // Set alpha based on concentration
+                    const alpha = Math.min(1, Math.pow(newA + newB, 1.5) * 1.5);
+                    newGrid[idx + 3] = alpha;
+
+                    // Gray value based on concentration contrast
+                    const gray = (newA * 0.3 + newB * 0.7) * 255;
+                    newGrid[idx] = newGrid[idx + 1] = newGrid[idx + 2] = gray;
+                }
+            }
+
+            // Apply new grid
+            for (let i = 0; i < grid.length; i++) {
+                grid[i] = newGrid[i];
+            }
+        }
+
+        function draw() {
+            ctx.clearRect(0, 0, canvas.width, canvas.height);
+
+            const imageData = ctx.createImageData(cols, rows);
+            const data = imageData.data;
+
+            // Copy from grid to imageData
+            for (let i = 0; i < grid.length; i += 4) {
+                data[i] = grid[i];     // R
+                data[i + 1] = grid[i + 1]; // G
+                data[i + 2] = grid[i + 2]; // B
+                data[i + 3] = grid[i + 3] * 255; // A
+            }
+
+            // Scale up to canvas size
+            ctx.imageSmoothingEnabled = false;
+            ctx.putImageData(imageData, 0, 0, 0, 0, cols, rows);
+        }
+
+        function animate() {
+            for (let i = 0; i < iterations; i++) {
+                updateGrid();
+            }
+            draw();
+            requestAnimationFrame(animate);
+        }
+
+        animate();
+    </script>
+</body>
+</html>
\ No newline at end of file
