In its Histoire de Tourbillon collection, Harry Winston recognizes the tourbillon as a medium of artistic expression unique in scope, depth and subject, a work of art that shows not only the time, but the nature of time itself. Three tourbillons are in action, each rotating at different speeds to perform distinct gravity defying functions. Two of them are nested one inside the other to rotate the fourth dimension of time through the three dimensions of space. In this bi-axial tourbillon, one tourbillon carriage rotates every 40 seconds within a second carriage going around in 120 seconds on an axis perpendicular to the first. The third tourbillon carriage rotates a separate balance on a single axis in the conventional way, but at the relatively high speed of one revolution every 36 seconds. This tourbillon is most effective when the watch is in a vertical position, and by rotating the balance quickly it minimizes its exposure to the effects of gravity.