Zoroaster Street and Madison Avenue in Manhattan. A sculpture of Zoroaster appears with other prominent religious figures on the south side of the exterior of Rockefeller Memorial Chapel on the campus of the University of Chicago. Although a few recent depictions of Zoroaster show the prophet performing some deed of legend, in general the portrayals merely present him in white vestments (which are also worn by present-day Zoroastrian priests). He often is seen holding a "baresman" (Avestan; Middle Persian "barsom"), which is generally considered to be another symbol of priesthood, or with a book in hand, which may be interpreted to
Zoroaster some conjecture that it depicts the Yaz culture), and thus it is implausible that the Gathas and Rigveda could have been composed more than a few centuries apart. These scholars suggest that Zoroaster lived in an isolated tribe or composed the Gathas before the 1200–1000 BCE migration by the Iranians from the steppe to the Iranian Plateau. The shortfall of the argument is the vague comparison, and the archaic language of Gathas does not necessarily indicate time difference. Other scholars propose a period between 7th and 6th century, for example, c. 650–600 BCE or 559–522 BCE. The latest possible date