Since I’m on a bit of a skull theme, Lucy Skaer’s Leviathan Edge – the skull of a sperm whale borrowed from National Museums Scotland for inclusion in her installation Thames and Hudson – popped into my mind. The skull is rather larger than those adorned by Damien Hirst or Gabriel Orozco. By about 14 foot or so. The whale skull is vast and its shape utterly unfamiliar. It’s a curious object made all the more fascinating by Skaer’s tantalising presentation of it in an enclosed space so that we can only see small sections of it through narrow slits.