Jewish Festivals: Permanent Knots

You may not tie permanent knots on Jewish festivals (and Shabbat).
Note A permanent knot is a knot intended to remain tied for at least 24 hours. Any strings you connect on Jewish festivals must be able to easily come undone, such as a bow.
Note Since opinions differ on what constitutes a permanent knot, we do not even tie knots that are intended to be untied, such as a double figure-eight knot.