Edit in JSFiddle

var lorenz =
function(h,a,b,c,x,y,z,j){setInterval(function(){j(x+=h*a*(y-x),y+=h*(x*(b-z)-y),z+=h*(x*y-c*z))},9)}

function init(){
  var max = 1000, i = 0, divs = [];

  for (i=0; i < max; i++){
    div = document.createElement("div");
    divs.push(div);
    document.body.appendChild(div);
  }

  function callback(x,y,z){
    divs[i=(i+1)%max].style.cssText = 
      "left:" + (x*8) + "px;" + 
      "top:" + (y*8)  + "px;" +
      "width:" + Math.abs(z/4) + "px;" + 
      "height:" + Math.abs(z/4) + "px;"
  }

  lorenz(0.008,10,28,8/3,0,10,10,callback);
}


init();

div { 
    background-color: #069; 
    opacity: 0.5;
    width: 5px;
    height: 5px;
    overflow: hidden;
    display: block;
    position: absolute;
    margin: 250px 250px;
    -webkit-border-radius: 100px;
    -moz-border-radius: 100px;
  }