I'm leaning towards of the idea of the falling pages. However the model I made is too rectilinear, too stiff. So I was exploring the look of paper when it flutters in the air, or when it falls. Here are a few sketches I've made based on that concept.
The sketch that I like the best is the top left corner. I think it fits in well with the triangular site that I've chosen for my building. My site is also on a slope, so I'm going to try to make it look like the paper is flowing upwards in the direction of the hill (or falling from the hill depending how you look at it).
I am going to work on a model to explore this more.