Dating from 1563, Bernard Palissy's essay De la Ville de Forteresse (1) provides a powerful starting point for the problematic of this paper, which is to reflect upon the`splintering spheres of security' in the contemporary`fortress city' (Davis, 1990; Low, 1997). A firstgeneration Huguenot and one of the most renowned artists and scientists of the French Renaissance (Lefaivre and Tzonis, 2004, page 138), Palissy was heavily exposed to the ferocious Catholic persecutions of the time. The aim of his essay, a study of the``design and arranging of a fortress city that is the most unassailable ever heard of '' (Palissy, 1988[1563]), was thus driven by the immediate need to protect both his own life and his coreligionist community in the city of La Rochelle.`H ave you ever seen anything made by the hand of man that it fits so precisely as the two shells and attachments of the aforesaid cockles and scallops? ... Do you think that fish which erect their fortresses in the form of a spiral or an Archimedean screw do so without reason? ... And I began to think that I could find no better counsel for the design of my Fortified Town and began to observe in order to find the fish that are the most industrious in Architecture and to take counsel from their industriousness. ... And having seen this, I found no better solution for the construction of my Fortified Town than to take as my example the fortress of the aforesaid purple whelk and therefore took up my compasses, ruler and other necessary tools to make my drawing thereof. Firstly, I drew the plan of a great rectangular square around which I drew a great number of houses, to which I added windows, doors and workshops all facing towards the outside of the plan and streets of the Town. At one of the corners of the aforesaid square, I drew a great doorway on which I marked the plan of the house or residence of the principal Governor of said Town in order to ensure that no person should enter said square without leave from the Governor. ... I drew the beginning of a street starting from the aforesaid gateway, surrounding the houses I had drawn around said square, setting out to build my Town in spiral form and line, following the form and