Team mascots, perhaps? Let's say the site was used for sporting competitions between area teams. The Mighty Dodos vs. the Fighting Scorpions. Team logos emblazoned on pillars.
If future archeologists were to excavate the site of an NFL game between the Ravens and the Colts, there would be a lot of blathering on about worship of birds and horses. Ravens symbolizing the underworld, Colts symbolizing fertility, etc.
I'm only half-kidding when I say this theory makes no less sense than the psychobabble speculation offered by the "experts" about this archeological find.
Amen to that one.