What would you think of a circus where the tight-rope walker wore a stout safety harness hitched to the roof-beam?And where there were two, perhaps three, nets stretched beneath him?
It wouldn’t be very thrilling. But, more importantly, he would probably fall into the nets quite a lot. After all, with so many devices to stop him hurting himself, why should he develop the skills and self-discipline to walk all the way across?










