Guarini’s models for the drawing of the ‘regular fortress’. Comparison with the pentagonal citadels in Turin and Modena.

The author who has studied on several occasions the relationship between geometry and design in Guarini’s work, presented at the last Fortmed 2015 a research culminating in the drawing of a geometric deconstruction concerning the ‘regular fortress’, a graphic scheme drawn by Guarini in the Trattato di Fortificatione (1676), which shows some similarities with the Citadel of Turin depicted in the Theatrum Sabaudiae. The present research arises as a progression of this earlier investigation and deepens, thanks to some refinements of the previous deconstruction and new graphical analyses, the comparison, in terms of shape and dimension, between Guarini’s scheme and that of two citadels - Turin and Modena - Guarini certainly knew, both for having seen them directly, and for having examined their representations by numerous drawings and views.