The segments that followed were divided in two main parts. The first part of the main artistic segment of the opening ceremony was called "Allegory." "Allegory" introduced the main conceptual themes and ideals that are going to be omnipresent throughout the entire opening ceremony, such as the confluence of the past and present, love and passion as the progenitors of history, and humanity's attempt to understand itself. The second part, called the "Clepsydra," or "Hourglass," celebrates the themes introduced in the "Allegory" section through a portrayal of Greek history from the ancient to the modern times.