diff --git a/source/screens/demo/examples/matrix.liquid b/source/screens/demo/examples/matrix.liquid
new file mode 100644
index 0000000..3eb62e9
--- /dev/null
+++ b/source/screens/demo/examples/matrix.liquid
@@ -0,0 +1,167 @@
+---
+title: Matrix
+tags:
+- demoExample
+---
+{% layout 'hippie/simple.liquid' %}
+
+{% block style %}
+<style>
+	html, body {
+		height: 100vh;
+		box-sizing: border-box;
+	}
+
+	body {
+		margin: 0;
+		background-color: grey;
+		font-family: 'Courier New', Courier, monospace;
+	}
+
+	#canvas {
+		display: block;
+		width: 100%;
+		height: 100%;
+	}
+</style>
+{% endblock %}
+
+{% block body %}
+<canvas id="canvas"></canvas>
+{% endblock %}
+
+{% block script %}
+<script>
+	const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
+	const canvas = document.getElementById("canvas");
+	const ctx = canvas.getContext("2d");
+	// const observer = new ResizeObserver(() => {
+	// 	canvas.width = canvas.clientWidth;
+	// 	canvas.height = canvas.clientHeight;
+	// 	console.log("resize");
+	// });
+
+	canvas.width = canvas.clientWidth;
+	canvas.height = canvas.clientHeight;
+
+	// observer.observe(canvas);
+
+	ctx.font = "24px 'Courier New', Courier, monospace";
+	ctx.textBaseline = "top";
+
+	let char = characters.charAt(Math.floor(Math.random() * characters.length));
+	let charMeasure = ctx.measureText(char);
+	let charW = Math.ceil(Math.max(charMeasure.actualBoundingBoxLeft + charMeasure.actualBoundingBoxRight, charMeasure.width));
+	let charH = charMeasure.fontBoundingBoxDescent + charMeasure.fontBoundingBoxAscent;
+	let glyph = {
+		text: char,
+		x: 0,
+		y: 0,
+		w: charH,
+		h: charH
+	}
+	let lane = [];
+	let max = Math.floor(canvas.clientHeight / glyph.h);
+
+	let newId = undefined;
+	let holdId = undefined;
+	let cleanId = undefined;
+	let newInterval = 300;
+	let holdInterval = 1000;
+	let cleanInterval = 400;
+	let newIndex = 0;
+	let cleanIndex = randomIntFrom(1, max);
+
+	console.log("init", newInterval);
+	console.log(glyph);
+
+	newId = setInterval(newTrail, newInterval);
+
+	function newTrail() {
+		clearInterval(holdId);
+
+		glyph.text = characters.charAt(Math.floor(Math.random() * characters.length));
+		console.log(newIndex, glyph.text);
+
+		lane.push([newIndex, glyph.text, glyph.y]);
+
+		ctx.fillStyle = "white";
+		ctx.fillRect(glyph.x, glyph.y, glyph.w, glyph.h);
+		ctx.fillStyle = "black";
+		ctx.fillText(glyph.text, Math.floor((charH - charW) / 2), glyph.y);
+
+		if (newIndex > 0) {
+			let prevY = glyph.y - glyph.h;
+			let alpha = randomBetween(.2, 1);
+			ctx.clearRect(glyph.x, prevY, glyph.w, glyph.h);
+			ctx.fillStyle = "rgba(0, 0, 0, " + alpha + ")";
+			ctx.fillRect(glyph.x, prevY, glyph.w, glyph.h);
+			ctx.fillStyle = "rgba(255, 255, 255, " + alpha + ")";
+			// TODO: can not use array lane if it is changed by cleanTrail()
+			ctx.fillText(lane[newIndex - 1][1], Math.floor((charH - charW) / 2), prevY);
+		}
+
+		if (newIndex === cleanIndex) {
+			console.log("clean", cleanInterval, cleanIndex);
+
+			cleanId = setInterval(cleanTrail, cleanInterval);
+		}
+
+		newIndex++;
+		glyph.y += glyph.h;
+
+		if (newIndex > max) {
+			// console.log("hold", holdInterval);
+			console.log("end");
+
+			clearInterval(newId);
+
+			newIndex = 0;
+			glyph.y = 0;
+			newInterval = randomIntFrom(100, 1000, 2);
+
+			// holdId = setTimeout(() => {
+			// 	console.log("clean", cleanInterval);
+
+			// 	holdInterval = randomIntFrom(1000, 10000, 3);
+			// 	cleanId = setInterval(cleanTrail, cleanInterval);
+			// }, holdInterval);
+		}
+	}
+
+	function cleanTrail() {
+		let pos = lane.shift();
+		console.log(pos);
+
+		ctx.clearRect(0, pos[2], glyph.w, glyph.h);
+
+		if (!lane.length) {
+			console.log("hold", holdInterval);
+
+			clearInterval(cleanId);
+
+			holdId = setTimeout(() => {
+				console.clear();
+				console.log("new", newInterval);
+
+				cleanIndex = randomIntFrom(1, max);
+				cleanInterval = randomIntFrom(1000, 10000, 3);
+				holdInterval = randomIntFrom(1000, 10000, 3);
+				newId = setInterval(newTrail, newInterval);
+			}, holdInterval);
+		}
+	}
+
+	function randomBetween(min, max) {
+		return (Math.random() * (max - min) + min).toFixed(2);
+	}
+
+	function randomIntFrom(min, max, pos = 0) {
+		pos = Math.pow(10, pos);
+		min = Math.ceil(min);
+		max = Math.floor(max);
+
+		return Math.floor((Math.random() * (max - min + 1) + min) / pos) * pos;
+	}
+</script>
+{% endblock %}
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