Imagining that the Harry Winston engineers were given carte blanche to create the third chapter in the Histoire de Tourbillon story is an understatement, given its unmistakable aesthetic break with the previous models. While the triple arches on the case and use of zalium ensure a certain degree of continuity with brand identity codes, this 20-piece limited edition is doubtless aimed at a new clientele. The aesthetic boldness of the geometrical design is matched by an undeniable technical feat. The gold and zalium case is composed of 77 parts and houses a 479-part movement. The visible part of the latter provides a spectacular three-dimensional show staged by three tourbillon carriages: that of the single tourbillon at 6 o’clock gravitates in 36 seconds, and that of the double bi-axial tourbillon at 9 o’clock performs a 120-second rotation with its outer carriage, while the inner carriage housing the balance, balance-spring and escapement spins once every 40 seconds around the perpendicular axis. This differential optimises the interaction between the two regulating systems. Such a stunning performance might almost eclipse the precious hour and minute indications appearing on the two upper discs, just above the power-reserve display paved with sapphires and citrines.