Franz et al,
Have you ever seen the movie "Labyrinth" which stars David Bowie (1986).
It is a Jim Henson movie. We bought the video, used, some time ago and
still watch it from time to time... it is very artful. The climatic
scene leads to a castle and the interior is set up like an M.C. Escher
art work, with distorted proportions and perspective. Just a thought, I
wonder if researching Medieval literature might turn up some leads or
links for your exploration.