Founded by Sylvain Berneron, Berneron approaches independent watchmaking from the principle that mechanics and design should be conceived as a single object rather than one being forced to accommodate the other. The Mirage was the first expression of that philosophy, abandoning the conventional round movement and symmetrical case in favour of an entirely shaped construction. Its flowing asymmetric form is governed by the Golden Ratio, producing a watch that appears almost distorted while remaining carefully proportioned. Even details such as the offset oval crown and the way the case extends over the strap were developed specifically for the design.

This is the yellow gold Sienna version of the original Mirage, ref. 3438MS.G02. Measuring 33.5mm across, 37.5mm long and only 7mm thick, its 18K yellow gold case surrounds a matching solid-gold dial with warm sienna-coloured markings and an integrated small-seconds display. Beneath it sits a proprietary shaped manual-wind movement developed with Le Cercle des Horlogers specifically to follow the unconventional architecture of the case. Its mainplate and bridges are themselves made from 18K gold, while the movement's curved wheels, balance and bridge echo the distortion visible from the front. The result is a rare example in which virtually every element of a watch has been developed around a single design idea.