Art from real human bones

Hundreds of hours spent Francois Robert, to create their work. Material was unusual - human bones.
He got them by buying old skeleton back in the mid 90's on sale at the medical school ... This series is called «Stop the Violence» - stop the violence. I think it is rather a "gesture" and discuss the moral aspects of this art does not make sense. Is that interesting bequeathed whether the author of this creation sebepodobnyh their bones?