In a similar way, there is also the Sabbath Wire: http://mentalfloss.com/article/91594/theres-wire-above-manhattan-youve-probably-never-noticed http://mentalflo

In a similar way, there is also the Sabbath Wire: http://mentalfloss.com/article/91594/theres-wire-above-manhattan-youve-probably-never-noticed http://mentalfloss.com/article/91594/theres-wire-above-manha... 18 miles of translucent wire stretches around NYC called an eruv: On the Sabbath, which is viewed as a day of rest, observant Jewish people aren't allowed to carry anything—books, groceries, even children—in public places (doing so is considered "work"). The eruv encircles much of Manhattan, acting as a symbolic boundary that turns the very public streets of the city into a private space, much like one's own home. This allows people to freely communicate and socialize on the Sabbath—and carry whatever they please—without having to worry about breaking Jewish law.