turtle.js

turtle(function(t) {
  var fns = [];
  [200, 300, 100].forEach(function(a) {
      [0, -90, 180, 90, 180].forEach(function(off) {
        fns.push(function(t) { return (Math.sin((t/a)) * 180) + off; });
      });
  });
  return fns;
});