Where does the Sabbath fit into Moses' social system?

Moses was the most innovative designer of a social system in world history. The ten commandments sit at the heart of this design. But where does the Sabbath fit? It is the only ritualistic member of the ten words, and it seems out of date in today's world. Tony claims that in fact the Sabbath is the linchpin of the whole design, and is vitally relevant to today's world. Discover why in this talk.