Despite the fact that you have said your original thoughts were not what you describe as this/these improvisation(s) reminding you of, it's difficult now for me to not picture your description as I listen.
I wonder for example, if Wolfi's "Styx" was a musical idea grown out of the mythical river, or the the river just seemed to fit an original musical idea?
Wolfi, to you...I admit to never being one for philosophy. I am very interested, however, in how you would define spiritual perceptions...and what would be the opposite of spiritual perceptions?