At one point in our walk across the grounds, we saw a young chinese man go to the spot where the Emperor would pray to the four compass points, and he himself knelt down on the mound and gave "obeisance" to each compass point. I highly doubt he really knew what he should do in the moment, but it was touching that he made the attempt. :)
This is a picture of what they referred to as "scripture". I think it might be something like a prayer inscribed on each wooden board.