When the U.S. Supreme Court convenes in Washington, the justices sit in their grand courtroom beneath a carved marble frieze depicting 18 great lawgivers from the ages. On the south wall are the ancients - Confucius, Octavian, and Moses holding the Ten Commandments. And on the north wall, along with Justice John Marshall and Napoleon Bonaparte, standing between Charlemagne and Justinian, is Muhammad, cradling a sword and a copy of the Holy Koran. In the furor caused by the Danish cartoons of Muhammad, many stories have circulated about Islam's prohibitions about artistic depictions of the prophet, or any human figures....