 However, it is placed in the center of one of the four squares beneath the dome, indicating the placement was not as random as it seems at first glance.Historian Nadine Schibille argues that it fits seamlessly into the original flooring, therefore she concludes that it was an original feature.Historian Silvia Pedone does not attempt to assign a specific date to it, but she theorizes that it was arranged differently than what is seen today.