Before I accidentally let the available technology determine the aesthetics of the piece, I want to look at possibilities. Since this is brainstorm style it may be a bit lyrical or stream of conscious.
layers secret things revealed / things beneath overlaid layered palimpsest
layers maps flow braided river stream beneath sketch ghost hidden
voices stories history personal narrative
What do these suggest? I don’t know. But probably means that I can’t just use the same old default menus, overlays, footers and headers out of the box.