So: Funny Village Voice article about Elliot Malkin's digital graffiti project, eRuv: A Street History in Semacode.

semacode for wikipedia's semacode entry

Malkin's project uses semacode posters, which have these funky-looking barcodes that, when photographed with a camera phone, will direct your phone's internet browser to a specific url. Pretty cool, but lost on people who, like me, don't invest much money in their phones.

Anyway, Malkin uses semacode to mark (well, partially) the former path of the Third Avenue el—and his project is called eruv (a Hebrew word roughly meaning a physically delimited communal area) because in 1907 one Rabbi Yehoshua Siegel used the el's path as the western border to an eruv encompassing the entire east side of Manhattan (the other boundaries being water). Why make the whole east side one community? Because, according to Talmudic law you can only carry things around on Shabbat inside your home or eruv. As the eruv wikipedia article points out, that law's a big bummer if you don't have an eruv: "the law on carrying created severe hardships and diminished the oneg ("joy") of Shabbat."

The Village Voice calls Siegel's eruvification of the east side a maphack ahead of its time, but it seems more—dare I say it?—like a lifehack to me: a creative way of getting stuff done within the restrictive parameters of your existence…and of guaranteeing the entire east side an onegful Shabbat.