Two knotty boys - head cage

 From the middle of your rope, measure from the chin to the bridge of the nose.

Where you've measured, tie a double coin knot.

Now measure from the bridge of the nose to the crown of the head.

Tie another double coin knot.

 Pull the rope down along towards the mouth. 

Wind it several times until it reaches the chin. 

Pull it back from there and make another double coin knot on the back of the neck.

Pull it under the rope as shown

Tie it off, tightening the head cage.

And there you have it. After you master the double coin knot, this isn't too difficult, as long as you have thinnish rope.

Isn't it lovely?