diff --git a/demo-02/README.md b/demo-02/README.md
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+# Demo 2: Fixing an Issue, Adding a new Feature 
+
+- `demo-01.index.html` has the output of a former run of `../demo1`
+- There is an issue where the background flickers as the last few particles
+  fade out. Smooth out the rapid color change.
+- Add a new feature: clicking should cause a burst of particles as well as
+  a shift in the overall hue.
+- The output of a previous plan is in `old-plan.md`.
diff --git a/demo-02/demo-01.index.html b/demo-02/demo-01.index.html
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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Particle Trail Effect</title>
+    <style>
+        * {
+            margin: 0;
+            padding: 0;
+            box-sizing: border-box;
+        }
+
+        body {
+            overflow: hidden;
+            background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
+            min-height: 100vh;
+            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
+        }
+
+        canvas {
+            display: block;
+            position: fixed;
+            top: 0;
+            left: 0;
+            z-index: 1;
+        }
+
+        .content {
+            position: relative;
+            z-index: 2;
+            display: flex;
+            flex-direction: column;
+            justify-content: center;
+            align-items: center;
+            min-height: 100vh;
+            color: white;
+            text-align: center;
+            pointer-events: none;
+        }
+
+        h1 {
+            font-size: 4rem;
+            font-weight: 300;
+            letter-spacing: 0.3em;
+            margin-bottom: 1rem;
+            text-shadow: 0 0 30px rgba(100, 200, 255, 0.5);
+        }
+
+        p {
+            font-size: 1.2rem;
+            opacity: 0.7;
+            letter-spacing: 0.1em;
+        }
+    </style>
+</head>
+<body>
+    <canvas id="particleCanvas"></canvas>
+    
+    <div class="content">
+        <h1>Particle Trail</h1>
+        <p>Move your cursor to create the magic</p>
+    </div>
+
+    <script>
+        const canvas = document.getElementById('particleCanvas');
+        const ctx = canvas.getContext('2d');
+
+        // Set canvas to full window size
+        function resizeCanvas() {
+            canvas.width = window.innerWidth;
+            canvas.height = window.innerHeight;
+        }
+        resizeCanvas();
+        window.addEventListener('resize', resizeCanvas);
+
+        // Mouse position tracking
+        const mouse = {
+            x: undefined,
+            y: undefined,
+            prevX: undefined,
+            prevY: undefined
+        };
+
+        window.addEventListener('mousemove', (e) => {
+            mouse.prevX = mouse.x;
+            mouse.prevY = mouse.y;
+            mouse.x = e.clientX;
+            mouse.y = e.clientY;
+
+            // Spawn particles on mouse move
+            if (mouse.prevX !== undefined) {
+                const dx = mouse.x - mouse.prevX;
+                const dy = mouse.y - mouse.prevY;
+                const distance = Math.sqrt(dx * dx + dy * dy);
+                
+                // Spawn more particles for faster movement
+                const particleCount = Math.min(Math.floor(distance / 2), 10);
+                for (let i = 0; i < particleCount; i++) {
+                    const t = i / particleCount;
+                    const x = mouse.prevX + dx * t;
+                    const y = mouse.prevY + dy * t;
+                    particles.push(new Particle(x, y));
+                }
+            }
+        });
+
+        // Touch support
+        window.addEventListener('touchmove', (e) => {
+            e.preventDefault();
+            const touch = e.touches[0];
+            mouse.prevX = mouse.x;
+            mouse.prevY = mouse.y;
+            mouse.x = touch.clientX;
+            mouse.y = touch.clientY;
+
+            if (mouse.prevX !== undefined) {
+                const dx = mouse.x - mouse.prevX;
+                const dy = mouse.y - mouse.prevY;
+                const distance = Math.sqrt(dx * dx + dy * dy);
+                
+                const particleCount = Math.min(Math.floor(distance / 2), 10);
+                for (let i = 0; i < particleCount; i++) {
+                    const t = i / particleCount;
+                    const x = mouse.prevX + dx * t;
+                    const y = mouse.prevY + dy * t;
+                    particles.push(new Particle(x, y));
+                }
+            }
+        }, { passive: false });
+
+        // Particle class
+        class Particle {
+            constructor(x, y) {
+                this.x = x;
+                this.y = y;
+                this.size = Math.random() * 4 + 2;
+                this.baseSize = this.size;
+                
+                // Random velocity for inertia effect
+                const angle = Math.random() * Math.PI * 2;
+                const speed = Math.random() * 2 + 0.5;
+                this.vx = Math.cos(angle) * speed;
+                this.vy = Math.sin(angle) * speed;
+                
+                // Color with variation
+                const hue = Math.random() * 60 + 180; // Blue-cyan range
+                this.color = `hsla(${hue}, 100%, 70%,`;
+                
+                this.life = 1; // Full life
+                this.decay = Math.random() * 0.02 + 0.01; // Random decay rate
+            }
+
+            update() {
+                // Apply inertia - particles continue moving
+                this.x += this.vx;
+                this.y += this.vy;
+                
+                // Slow down over time (friction)
+                this.vx *= 0.98;
+                this.vy *= 0.98;
+                
+                // Shrink size
+                this.size = this.baseSize * this.life;
+                
+                // Fade out
+                this.life -= this.decay;
+            }
+
+            draw() {
+                ctx.beginPath();
+                ctx.arc(this.x, this.y, this.size, 0, Math.PI * 2);
+                ctx.fillStyle = this.color + this.life + ')';
+                ctx.fill();
+                
+                // Add glow effect
+                ctx.shadowBlur = 15;
+                ctx.shadowColor = this.color + '0.5)';
+            }
+        }
+
+        // Particles array
+        let particles = [];
+
+        // Animation loop
+        function animate() {
+            // Clear with slight fade effect for trails
+            ctx.fillStyle = 'rgba(26, 26, 46, 0.1)';
+            ctx.fillRect(0, 0, canvas.width, canvas.height);
+            
+            // Reset shadow for better performance
+            ctx.shadowBlur = 0;
+
+            // Update and draw particles
+            for (let i = particles.length - 1; i >= 0; i--) {
+                const particle = particles[i];
+                particle.update();
+                particle.draw();
+                
+                // Remove dead particles
+                if (particle.life <= 0) {
+                    particles.splice(i, 1);
+                }
+            }
+
+            // Limit particles for performance
+            if (particles.length > 500) {
+                particles.splice(0, particles.length - 500);
+            }
+
+            requestAnimationFrame(animate);
+        }
+
+        // Start animation
+        animate();
+
+        // Spawn some initial particles for visual interest
+        for (let i = 0; i < 50; i++) {
+            const x = Math.random() * canvas.width;
+            const y = Math.random() * canvas.height;
+            const particle = new Particle(x, y);
+            particle.life = Math.random() * 0.5 + 0.5;
+            particles.push(particle);
+        }
+    </script>
+</body>
+</html>
diff --git a/demo-02/old-plan.md b/demo-02/old-plan.md
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+# Particle Burst Feature Plan
+
+## Overview
+Add a click interaction that creates a radial burst of particles and shifts the color palette.
+
+## Implementation Details
+
+### 1. Global State Addition
+Add a `hueOffset` variable to track the current color shift:
+```javascript
+let hueOffset = 0; // Shifts the particle color palette
+```
+
+### 2. Click Event Handler
+Add to the script (after the mousemove listener):
+```javascript
+canvas.addEventListener('click', (e) => {
+    const clickX = e.clientX;
+    const clickY = e.clientY;
+
+    // Shift hue for variety
+    hueOffset += 15 + Math.random() * 15; // Shift by 15-30 degrees
+
+    // Create burst of particles
+    const burstCount = 40;
+    for (let i = 0; i < burstCount; i++) {
+        particles.push(new BurstParticle(clickX, clickY, hueOffset));
+    }
+});
+```
+
+### 3. BurstParticle Class (or extend Particle)
+Create particles with radial velocity:
+- Position: click coordinates
+- Angle: random 0 to 2π
+- Speed: random range (e.g., 2-8) for varying distances
+- Size: slightly larger than normal particles (6-12px)
+- Decay: slightly faster for quick burst effect
+
+### 4. Particle Constructor Update
+Modify the `Particle` constructor to accept an optional hue offset:
+```javascript
+constructor(x, y, hueShift = 0) {
+    // ... existing code ...
+    const hue = Math.random() * 60 + 180 + hueShift; // Blue-cyan + shift
+    this.color = `hsla(${hue}, 100%, 70%,`;
+}
+```
+
+## File Changes
+- **index.html**: Add click listener, hueOffset variable, and optional hueShift parameter to Particle
+
+## Visual Effect
+- Each click creates an explosion of blue-cyan particles at the cursor
+- Subsequent clicks shift the color palette gradually (e.g., cyan → green → yellow)
+- Trail effect continues to work with the new particles
