In reviewing the evolution of the Cartier Ronde collection, I have observed a notable shift toward a 40mm case diameter. Could someone elaborate on the technical implications of this design change? Specifically, I am interested in understanding how the enlargement affects the movement layout, water resistance, and overall ergonomics on the wrist compared to earlier, more traditionally sized models. Furthermore, what adjustments, if any, have been implemented in the case construction or material choices to maintain the watch’s delicate balance between aesthetics and functional performance? Any insights into the design rationale and its impact on wearer comfort and technical precision would be appreciated.