An eruv is a ritual halakhic enclosure made for the purpose of allowing activities which are normally prohibited on Shabbat, specifically: carrying objects from a private domain to a semi-public domain (carmelit), and transporting objects four cubits or more within a semi-public domain. The enclosure is found within some Jewish communities, especially Orthodox ones.
An eruv pole and wire outside the Tower of David, Jerusalem. Only the higher of the two visible wires is used by the eruv.
A fence being used as an eruv boundary in Israel
A gate in the eruv of Avnei Eitan, Golan Heights
Preparation of an eruv between Oz Zion and Giv'at Asaf
A mechitza in Judaism is a partition, particularly one that is used to separate men and women.
Separation between men and women at the Western Wall
This mechitza was created for the Suburban Torah Center in Livingston, New Jersey, and features etched glass ornamentation.
View over the mechitza from the women's balcony of the B'nai Jacob Synagogue (Ottumwa, Iowa)