Hello. I've come across a physics curiosity while reading the Tao-te Ching. Chapter 11 begins by stating (Robert G. Henricks translation)... "Thirty spokes unite in one hub; It is precisely where there is nothing, that we find the usefulness of the wheel." At first, I thought this was completely wrong. Surely, a solid-wheel would be stronger and more useful than a ring with spokes. But later, the idea came to me that this wheel with spokes might in fact be able to support more weight. I've never seen a solid wheel on a cart, or a bicycle, or anything. Also, there's just some intuition that tells me that this type of wheel will be stronger. Does anyone know if this is really true, and if so, what are the principles of physics behind it?