diff --git a/CM2030 Graphics Programming/Topic 4/4.2.1/sketch.js b/CM2030 Graphics Programming/Topic 4/4.2.1/sketch.js
index decd031..91cf119 100644
--- a/CM2030 Graphics Programming/Topic 4/4.2.1/sketch.js	
+++ b/CM2030 Graphics Programming/Topic 4/4.2.1/sketch.js	
@@ -1,7 +1,39 @@
-function setup() {
+let Engine = Matter.Engine,
+    Render = Matter.Render,
+    World  = Matter.World,
+    Bodies = Matter.Bodies;
+let engine;
+let box1;
+let box2;
+let ground;
 
+function setup() {
+  createCanvas(900, 600);
+  // create engine
+  engine = Engine.create();
+  box1 = Bodies.rectangle(200, 200, 80, 80, {restitution: .8, friction: 0.5});
+
+  let options = {isStatic: true, angle: Math.PI * 0.06};
+  ground = Bodies.rectangle(400, 500, 810, 10, options);  
+  // add bodies to world
+  World.add(engine.world, [box1, ground]);
 }
 
 function draw() {
+  background(0);
+  Engine.update(engine);
+  rectMode(CENTER);
+  push();
+  let pos = box1.position;
+  translate(pos.x, pos.y);
+  rotate(box1.angle);
+  rect(0, 0, 80, 80);
+  pop();
 
+  push();
+  pos = ground.position;
+  translate(pos.x, pos.y);
+  rotate(ground.angle);
+  rect(0, 0, 810, 10);
+  pop();
 }