Lot's of German sauces on the Hesse family. Dad was a Opera and so the Son also became one. Volker Hess has made his first steps at the Bern City theater under a Will Quadflieg. Hesse and All the theater guys he learned uder all have German liberal arts degrees back from the short period of time they weren't utter bullshit in 70% . It is safe to assume that Hesse knows what all that bizarre shit in his performances actually is.
http://tls.theaterwissenschaft.ch/wiki/Rudolf_Hesse
http://tls.theaterwissenschaft.ch/wiki/Volker_Hesse
Directors Hesse had worked for:
http://tls.theaterwissenschaft.ch/wiki/Will_Quadflieg
http://tls.theaterwissenschaft.ch/wiki/Leopold_Lindtberg
http://tls.theaterwissenschaft.ch/wiki/Hans_Hollmann
Some news about the performance at the Gotthard tunnel. Looks like not everyone was happy with Muslims mystics being a part of it.
https://archive.is/W66Dg
https://www.kath.ch/newsd/volker-hesse-hat-nichts-gegen-derwische/
https://www.srf.ch/kultur/buehne/viel-theater-um-einen-tunnel-volker-hesses-gotthard-spektakel
http://www.20min.ch/schweiz/news/story/Es-waren-eben-doch-Derwische-am-Gotthard-19167301
It has also won some prize:
http://www.accademiadimitri.ch/news.php?read=the-sacre-del-gottardo-ceremony-wins-the-2017-xaver-prize