diff --git a/config.yaml b/config.yaml
index 3dc1d7f..54f7ee2 100644
--- a/config.yaml
+++ b/config.yaml
@@ -13,6 +13,9 @@ menu:
     - name: ~ekkie
       pageRef: /
       weight: -1
+    - name: spiral
+      url: /spiral.html
+      weight: 100
     - name: twtxt
       url: /twtxt.txt
       weight: 100
diff --git a/static/spiral.html b/static/spiral.html
new file mode 100644
index 0000000..def47ec
--- /dev/null
+++ b/static/spiral.html
@@ -0,0 +1,265 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+	<meta charset="UTF-8">
+	<title>SpiralThing</title>
+	<style>
+	body {
+		margin: 0;
+		font-family: sans;
+	}
+	#ogl-canvas {
+		border: none;
+		position: absolute;
+		top: 0;
+		left: 0;
+	}
+	.hidden {
+		display: none !important;
+	}
+	#controls {
+		z-index: 1;
+		position: relative;
+		margin: 0.5em;
+		background-color: white;
+		display: inline-block;
+		padding: 0.5em;
+		border: 1px solid black;
+	}
+	</style>
+</head>
+<body>
+	<div id="controls" class="hidden">
+		<h1>Controls</h1>
+		<label>Colors</label>
+		<input type="color" id="color1" name="color1" value="#FFFFFF">
+		<input type="color" id="color2" name="color2" value="#000000">
+		<br>
+		<label for="ratio">Ratio</label>
+		<input type="number" id="ratio" name="ratio" min="0" max="1" step="0.05" value="0.5">
+		<br>
+		<label for="arms">Arms</label>
+		<input type="number" id="arms" name="arms" min="1" max="100" step="1" value="2">
+		<br>
+		<label for="spiraldense">Density</label>
+		<input type="number" id="spiraldense" name="spiraldense" min="0" max="100" step="0.05" value="5">
+		<br>
+		<label for="spiraldiff">Distortion</label>
+		<input type="number" id="spiraldiff" name="spiraldiff" min="0" max="100" step="0.05" value="0.15">
+		<br>
+		<label for="speed">Speed</label>
+		<input type="number" id="speed" name="speed" min="-5" max="5" step="0.1" value="1">
+		<br>
+		<label for="mirror">Mirror</label>
+		<input type="checkbox" id="mirror" name="mirror">
+		<br>
+	</div>
+	<canvas id="ogl-canvas" style="border: none"></canvas>
+	<script id="draw-shader-fs" type="x-shader/x-fragment">
+precision highp float;
+
+uniform vec2 iResolution;
+uniform vec2 iMouse;
+uniform float iTime;
+
+const float pi = 3.141592654;
+
+uniform vec3 color1;
+uniform vec3 color2;
+uniform float ratio;
+uniform float arms;
+uniform float spiraldense;
+uniform float spiraldiff;
+uniform float speed;
+uniform float mirrored;
+
+void mainImage(out vec4 fragColor, in vec2 fragCoord)
+{
+	vec2 uv = (fragCoord.xy - 0.5 * iResolution.xy) / iResolution.y;
+	float r = length(uv);
+	float theta = mirrored * atan(uv.y, uv.x);
+	float alias = 10. / max(iResolution.x, iResolution.y) / pow(r, 0.75);
+	fragColor = vec4(mix(color1, color2, smoothstep(ratio + alias, ratio - alias,
+		abs(2. * fract(arms * theta / (2.*pi) + spiraldense * pow(r, spiraldiff) + speed * iTime) - 1.))), 1.);
+}
+
+void main()
+{
+	mainImage(gl_FragColor, gl_FragCoord.xy);
+}
+	</script>
+	<script id="draw-shader-vs" type="x-shader/x-vertex">
+attribute vec2 inPos;
+
+void main()
+{
+	gl_Position = vec4(inPos, 0.0, 1.0);
+}
+	</script>
+	<script>
+var canvas, gl, vp_size, prog, bufObj = {}, mousepos = [0, 0];
+var data = {}
+
+var icolor1 = document.getElementById("color1");
+var icolor2 = document.getElementById("color2");
+var iratio = document.getElementById("ratio");
+var iarms = document.getElementById("arms");
+var ispiraldense = document.getElementById("spiraldense");
+var ispiraldiff = document.getElementById("spiraldiff");
+var ispeed = document.getElementById("speed");
+var imirrored = document.getElementById("mirror");
+
+function updatevars() {
+	data.color1 = hextorgb(icolor1.value);
+	data.color2 = hextorgb(icolor2.value);
+	data.ratio = parseFloat(iratio.value);
+	data.arms = parseInt(iarms.value);
+	data.spiraldense = parseFloat(ispiraldense.value);
+	data.spiraldiff = parseFloat(ispiraldiff.value);
+	data.speed = parseFloat(ispeed.value);
+	data.mirrored = imirrored.checked ? -1 : 1;
+	history.replaceState(null, "", "?" + encodeURIComponent(JSON.stringify(data)))
+}
+
+function hextorgb(hex) {
+	hex = hex.slice(1);
+	r = parseInt(hex.substring(0, 2), 16) / 255;
+	g = parseInt(hex.substring(2, 4), 16) / 255;
+	b = parseInt(hex.substring(4, 6), 16) / 255;
+	return [r, g, b];
+}
+
+function rgbtohex(rgb) {
+	r = rgb[0];
+	g = rgb[1];
+	b = rgb[2];
+	toHex = c => {
+		hex = Math.round(c * 255).toString(16);
+		return hex.length === 1 ? '0' + hex : hex;
+	}
+	return `#${toHex(r)}${toHex(g)}${toHex(b)}`;
+}
+
+function initScene() {
+	try {
+		data = JSON.parse(decodeURIComponent(window.location.search.slice(1)));
+		if (data.color1 !== undefined)
+			icolor1.value = rgbtohex(data.color1);
+		if (data.color2 !== undefined)
+			icolor2.value = rgbtohex(data.color2);
+		if (data.ratio !== undefined)
+			iratio.value = data.ratio;
+		if (data.arms !== undefined)
+			iarms.value = data.arms;
+		if (data.spiraldense !== undefined)
+			ispiraldense.value = data.spiraldense;
+		if (data.spiraldiff !== undefined)
+			ispiraldiff.value = data.spiraldiff;
+		if (data.speed !== undefined)
+			ispeed.value = data.speed;
+		if (data.mirrored !== undefined)
+			imirrored.value = data.mirrored;
+	} catch(e) {}
+	icolor1.oninput = updatevars;
+	icolor2.oninput = updatevars;
+	iratio.oninput = updatevars;
+	iarms.oninput = updatevars;
+	ispiraldense.oninput = updatevars;
+	ispiraldiff.oninput = updatevars;
+	ispeed.oninput = updatevars;
+	imirrored.oninput = updatevars;
+
+	updatevars();
+
+	canvas = document.getElementById("ogl-canvas");
+	canvas.onclick = function() { document.getElementById('controls').classList.toggle('hidden') }
+	gl = canvas.getContext("experimental-webgl");
+	if (!gl)
+	  return;
+
+	canvas.addEventListener('mousemove', (e) => {
+		mousepos = [e.clientX, e.clientY];
+	});
+
+	progDraw = gl.createProgram();
+	for (let i = 0; i < 2; ++i) {
+		let source = document.getElementById(i==0 ? "draw-shader-vs" : "draw-shader-fs").text;
+		let shaderObj = gl.createShader(i==0 ? gl.VERTEX_SHADER : gl.FRAGMENT_SHADER);
+		gl.shaderSource(shaderObj, source);
+		gl.compileShader(shaderObj);
+		let status = gl.getShaderParameter(shaderObj, gl.COMPILE_STATUS);
+		if (!status) alert(gl.getShaderInfoLog(shaderObj));
+		gl.attachShader(progDraw, shaderObj);
+		gl.linkProgram(progDraw);
+	}
+	status = gl.getProgramParameter(progDraw, gl.LINK_STATUS);
+	if ( !status ) alert(gl.getProgramInfoLog(progDraw));
+	progDraw.inPos = gl.getAttribLocation(progDraw, "inPos");
+	progDraw.iTime = gl.getUniformLocation(progDraw, "iTime");
+	progDraw.iMouse = gl.getUniformLocation(progDraw, "iMouse");
+	progDraw.iResolution = gl.getUniformLocation(progDraw, "iResolution");
+	progDraw.color1 = gl.getUniformLocation(progDraw, "color1");
+	progDraw.color2 = gl.getUniformLocation(progDraw, "color2");
+	progDraw.ratio = gl.getUniformLocation(progDraw, "ratio");
+	progDraw.arms = gl.getUniformLocation(progDraw, "arms");
+	progDraw.spiraldense = gl.getUniformLocation(progDraw, "spiraldense");
+	progDraw.spiraldiff = gl.getUniformLocation(progDraw, "spiraldiff");
+	progDraw.speed = gl.getUniformLocation(progDraw, "speed");
+	progDraw.mirrored = gl.getUniformLocation(progDraw, "mirrored");
+	gl.useProgram(progDraw);
+
+	var pos = [ -1, -1, 1, -1, 1, 1, -1, 1 ];
+	var inx = [ 0, 1, 2, 0, 2, 3 ];
+	bufObj.pos = gl.createBuffer();
+	gl.bindBuffer( gl.ARRAY_BUFFER, bufObj.pos );
+	gl.bufferData( gl.ARRAY_BUFFER, new Float32Array( pos ), gl.STATIC_DRAW );
+	bufObj.inx = gl.createBuffer();
+	bufObj.inx.len = inx.length;
+	gl.bindBuffer( gl.ELEMENT_ARRAY_BUFFER, bufObj.inx );
+	gl.bufferData( gl.ELEMENT_ARRAY_BUFFER, new Uint16Array( inx ), gl.STATIC_DRAW );
+	gl.enableVertexAttribArray( progDraw.inPos );
+	gl.vertexAttribPointer( progDraw.inPos, 2, gl.FLOAT, false, 0, 0 );
+
+	gl.enable( gl.DEPTH_TEST );
+	gl.clearColor( 0.0, 0.0, 0.0, 1.0 );
+
+	window.onresize = resize;
+	resize();
+	requestAnimationFrame(render);
+}
+
+function resize() {
+	//vp_size = [gl.drawingBufferWidth, gl.drawingBufferHeight];
+	vp_size = [window.innerWidth, window.innerHeight];
+	//vp_size = [256, 256]
+	canvas.width = vp_size[0];
+	canvas.height = vp_size[1];
+}
+
+function render(deltaMS) {
+
+	gl.viewport( 0, 0, canvas.width, canvas.height );
+	gl.clear( gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT );
+
+	gl.uniform1f(progDraw.iTime, deltaMS/1000.0);
+	gl.uniform2f(progDraw.iResolution, canvas.width, canvas.height);
+	gl.uniform2f(progDraw.iMouse, mousepos[0], mousepos[1]);
+	gl.uniform3fv(progDraw.color1, data.color1);
+	gl.uniform3fv(progDraw.color2, data.color2);
+	gl.uniform1f(progDraw.ratio, data.ratio);
+	gl.uniform1f(progDraw.arms, data.arms);
+	gl.uniform1f(progDraw.spiraldense, data.spiraldense);
+	gl.uniform1f(progDraw.spiraldiff, data.spiraldiff);
+	gl.uniform1f(progDraw.speed, data.speed);
+	gl.uniform1f(progDraw.mirrored, data.mirrored);
+	gl.drawElements( gl.TRIANGLES, bufObj.inx.len, gl.UNSIGNED_SHORT, 0 );
+
+	requestAnimationFrame(render);
+}
+
+initScene();
+
+window.onload = initScene;
+	</script>
+</body>
+</html>
