http://dswarmsikhttkg7jgsoyfiqpj3ighupfrvuz5ri3lu5q2dlqyrpgk7ad.onion/share/archive/misc/zender.A_Roadmap_for_Orpheus.html
The theatrical means: action, pictures, instrumental music,
singing, spoken texts, are defined as 5 ’parameters’. During the course
of the piece, they are combined in several formations, where —
according to mathematical law — 31 combinations are possible. That is
why Don Quijote consists of 31 scenes that represent a new approach of
the theatrical possibilities in the guise of ’theatrical adventures’.