How to build an Eruv

The Eruv, has been an important part of Jewish communities for thousands of years. It involves creating a virtual wall around a community that according to Jewish law will allow people within the wall to carry things on the streets on the Shabbat. Dozens of Eruvs have been built in the US, many of them controversial. A discussion of what the Eruv entails, how it works and how to build a communal Eruv.