episode's veracity, Rabbeinu Tam did disagree with the opinion of his antecedent. Today, both "Rashi tefillin" and "Rabbeinu Tam tefillin" are produced: the Shulchan Aruch requires wearing Rashi's version and recommends that God-fearing Jews wear both in order to satisfy both halakhic opinions. However: However, many Sephardic and chasidic Jews wear Rabbeinu Tam's Tefillin (in addition to wearing Rashi's) per opinions presented in the Shulchan Aruch and its extensive commentaries authored throughout the early-modern and modern era. The rise and articulation of chasidic philosophy has conflated the kabbalistic and halakhic aspects of Rabbeinu Tam's position, popularizing the custom to wear both pairs every day. Wearing Rabbeinu Tam tefillin is an almost universal custom among the many and diverse communities that follow the teachings of the Baal Shem Tov and his students. Mezuzah Another halakhic disagreement between Rabbeinu Tam and Rashi concerns the placement of the mezuzah. Rashi rules that it should be mounted on the doorpost in a vertical position; Rabbeinu Tam holds that it should be mounted horizontally. In a compromise solution, many Ashkenazi Jews place the mezuzah on the door in a slanted position. Sephardi Jews mount the mezuzah vertically, per the opinions of Rashi, Maimonides, and the Shulchan Aruch. Liturgical poet In the field of Hebrew poetry the importance of R. Tam is not slight. He was influenced by the poetry of the Spaniards, and is the chief representative of the transition period, in Christian lands, from the old "payyeṭanic" mode of expression to the more graceful forms of the Spanish school. According to Zunz, he composed the following pieces for the synagogue: (1) several poems for the evening prayer of Sukkot and of Shemini Atzeret; (2) a hymn for the close of Sabbath on which a wedding is celebrated; (3) a hymn for the replacing of the Torah rolls in the Ark on Simchat Torah; (4) an "ofan" in four metric strophes; (5) four Aramaic reshut; (6) two selichot (the second is reproduced by Zunz in S.P. p. 248, in German verse). It must, however, be remarked that there was a synagogal poet by the name of Jacob ben Meïr (Levi) who might easily have been confounded with the subject of this article, and therefore Tam's authorship of all of these poems is not above doubt. The short poems which sometimes precede his responsa also show great poetic talent and a pure Hebrew style (see Bacher