The most well-known is the Birds' Head Haggadah (Germany, circa 1300). Because such creatures as gryphons, harpies, sphinxes, and the phoenix do not actually exist, no violation of the prohibition is perceived in such depictions. This is based on the fact that the commandment, as stated in Exodus, refers specifically to "anything in the heaven above, on the earth below, or in the water below the land." However, it is forbidden to make the four faces on the Divine Chariot of the Book of Ezekiel or the ministering angels, because these are believed to be real beings that actually exist "in the heaven above." (Kitzur Shulchan Aruch 168:1) Differences across media Although the prohibition applies mainly to sculpture, there are some authorities who prohibit two-dimensional full-face depictions. Some base this upon their understanding of the Talmud, and others based it upon Kabbalah. Of note is the portrait of Rabbi Tzvi Ashkenazi (known as "the Hakham Tzvi"), which is housed in the Jewish Museum in London. Based on his interpretation of this prohibition, Tzvi refused to sit for his portrait. However, the London Jewish Community wanted a portrait, so they commissioned the portrait to be done without the Tzvi's knowledge. Tzvi's son, Rabbi Jacob Emden, says it was a perfect likeness. There is one type of representation, bas-relief or raised representation on a flat surface, that is particularly problematic. Rabbi Jacob Emden discusses a medal struck in honor of Rabbi Eliezer Horowitz that features Horowitz's portrait. Emden ruled this violated the injunction against depictions. Many hold that such representations in the synagogue either violate this injunction or are not permitted, as they give the appearance of violating this injunction. Most notably, Rabbi David ibn Zimra and Rabbi Joseph Karo hold that carvings of lions (representing the Lion of Judah) are inappropriate in synagogues. Some authorities hold that Judaism has no objection to photography or other forms of two-dimensional art, and depictions of humans can be seen in religious books such as the Passover Haggadah, as well as children's books about biblical and historical personages. Although most Hasidic Jews object to having televisions in their homes, this is not related to prohibitions against idolatry, but, rather, to the content of network and cable programming. Hasidim of all groups regularly display portraits of their Rebbes, and, in some communities, the children trade "rabbi cards" that are similar to baseball cards. In both Hasidic