I have seen Butoh classes offered for a while now but I hadn’t quite realised what it was. I knew it was dance based but not that it was so performance art related. Perhaps one might think that only the Japanese with their nuclear holocaust WWII experiences [and being steeped in Kabuki theatre] could come up with such a particular/peculiar form.
This dance of darkness though, seems related to the biblical notion of wearing sackcloth and having ashes sprinkled on the head as a sign of penitence or mourning (Matt 11:21)? Itself perhaps related to ancient Egyptian funeral dances with expressions of grief demonstrated by the performers placing their hands on their heads and making the ka gesture, both arms upraised.
Certainly Butoh seems to have influenced modern Japanese Horror; one need only look at the movements of characters in The Grudge or The Ring, say.