text: var Example = Example || {};
  
  Example.ballPool = function() {
      Matter.use(
          'matter-wrap'
      );
      
      var Engine = Matter.Engine,
          Render = Matter.Render,
          Runner = Matter.Runner,
          Composite = Matter.Composite,
          Composites = Matter.Composites,
          Common = Matter.Common,
          MouseConstraint = Matter.MouseConstraint,
          Mouse = Matter.Mouse,
          World = Matter.World,
          Bodies = Matter.Bodies;
  
      // create engine
      var engine = Engine.create(),
          world = engine.world;
  
      // create renderer
      var render = Render.create({
          element: document.body,
          engine: engine,
          options: {
              width: 800,
              height: 600,
              showAngleIndicator: true
          }
      });
  
      Render.run(render);
  
      // create runner
      var runner = Runner.create();
      Runner.run(runner, engine);
  
      // add bodies
      World.add(world, [
          Bodies.rectangle(400, 600, 1200, 50.5, { isStatic: true })
      ]);
  
      var stack = Composites.stack(100, 0, 10, 8, 10, 10, function(x, y) {
          return Bodies.circle(x, y, Common.random(15, 30), { restitution: 0.6, friction: 0.1 });
      });
      
      World.add(world, [
          stack,
          Bodies.polygon(200, 460, 3, 60),
          Bodies.polygon(400, 460, 5, 60),
          Bodies.rectangle(600, 460, 80, 80),
          Bodies.capsule(500, 460, 40, 100)
      ]);
  
      // add mouse control
      var mouse = Mouse.create(render.canvas),
          mouseConstraint = MouseConstraint.create(engine, {
              mouse: mouse,
              constraint: {
                  stiffness: 0.2,
                  render: {
                      visible: false
                  }
              }
          });
  
      World.add(world, mouseConstraint);
  
      // keep the mouse in sync with rendering
      render.mouse = mouse;
  
      // fit the render viewport to the scene
      Render.lookAt(render, {
          min: { x: 0, y: 0 },
          max: { x: 800, y: 600 }
      });
  
      // wrapping using matter-wrap plugin
      var allBodies = Composite.allBodies(world);
  
      for (var i = 0; i < allBodies.length; i += 1) {
          allBodies[i].plugin.wrap = {
              min: { x: render.bounds.min.x - 100, y: render.bounds.min.y },
              max: { x: render.bounds.max.x + 100, y: render.bounds.max.y }
          };
      }
  
      // context for MatterTools.Demo
      return {
          engine: engine,
          runner: runner,
          render: render,
          canvas: render.canvas,
          stop: function() {
              Matter.Render.stop(render);
              Matter.Runner.stop(runner);
          }
      };
  };
  
  if (typeof module !== 'undefined') {
      module.exports = Example[Object.keys(Example)[0]];
  }