The office of the US president, the Oval Office, hence the shape. What's so special about this picture is not the thing that it is the office of the president, but the mystery of the Seal of the President at the floor. The claw of the eagle is holding arrows and olive branch. According to Dan Brown's novel Deception Point, the head turns to the olive branch in times of peace. And during the times of war the head mysteriously turns to the arrows. No one really knows the secret behind this mystery. The president and the office's caretaker are the only ones who knows the secret.