(This isn't quite as nonsensical as it first appears: _hareng saur_ (Pickled Herring) is a francophone pun for _art Ensor_ (Ensor's art) - the skeletons are Ensor's critics.)
You can see what is probably the original of the busby hat worn by one of the skeletons in this photo of Ensor's studio: https://commons.wikimedia.org/wiki...
You can see what is probably the original of the busby hat worn by one of the skeletons in this photo of Ensor's studio: https://commons.wikimedia.org/wiki...