Bruno Kreuzberg explains below that “avant-garde” in a visual sense are things that are new, that amaze you, that move you when you see them. That’s what he experienced when he saw the living disco ball-performance by Bella Berlin for the first time. Via theavantgardediaries.
I was working with a dutch designer (Malenka Produces) who created a living mirror ball and toured throughout European clubs about 10-15 years ago. It was really exceptional back then and still looks kinda cool, especially if the person wearing it can dance and perform.