But it could also be a sluice for water to irrigate a green cover or gardens along the pyramid.
But I also imagine (represented by plastic tubing) a walkway where people could walk through the sky. Or it could be a water chute. Or...
...perhaps this could just be a format for a variety of structures. Needless to say my "model" is primitive and not professional, but then it is just a fantasy not an actual building plan.
Click on the title of this entry if you want to see a slide show of the stages of making this model.