Tefillin are the strangest-looking thing an observant Jew does and among the best documented as ancient — specimens from the second and first centuries BCE were found in the Qumran caves, containing the same four Torah passages used today. The hand-tefillin goes on first, on the weaker arm, opposite the heart, wound seven times down the forearm and then around the fingers with a verse from Hosea about betrothal; the head-tefillin sits above the hairline, centred. They are not worn on Shabbat or festivals, on the reasoning that those days are themselves the sign and a second sign would be redundant. The tallit gadol is worn for morning prayer, with fringes tied in a specified pattern; the tallit katan is worn under the shirt all day, and in Israel you can identify a boy's school from whether the fringes are out. Ashkenazi and Sephardi authorities disagree about the internal order of the parchments — Rashi's order against Rabbeinu Tam's — and Hasidic and Sephardi men who can afford it wear both sets in succession. Women's obligation is the live question: exempt in traditional halakha as a time-bound commandment, permitted by some medieval authorities, standard in Reform and Conservative practice, and increasingly visible in Modern Orthodox women's prayer groups over Orthodox objection.