I should add that the Barber swing is not in plane past the midway point because he has not rotated his left arm to keep the clubhead and shaft on the plane set up at address. He gets it back on plane at the top by rotating the forearm and looping the clubhead at a time when the clubhead is moving slowly because his arms have almost stopped. It is really neat the way he does it and is unique to him and the way he learnt to play. However in the context of simple, uncomplicated swings it is at the other end of the scale.