We had a Open House Expo in the weekend of 16-17 march 2019. You can view a virtual tour of this expo where some background info and ‘secrets’ are revealed by excellent guide Hildegard:
After starting the video, click on the fullscreen icon in the bottomright to view bigger. For english subtitels, click on the subtitles icon.
Also you can view the full movie of the dancefilm here: Hildegard Dance White on Black