Good old-fashioned porcelain type from the sixties
Looking up how poo has already been used in art to defend my own toilet art installation in a well-known gallery. The newspaper article provoked letters to the editor in disgust that I had taken photos of my own faeces and used them in my 'Ruminator's Digest' that accompanied the bog. So hence forth, my own letter to the editor may well quote you if you don't mind, and if they will let me :-) I'd love to send you photos!