The star is at six o'clock though. That's where the mystery double tourbillon mechanism is. Not only does the entire escapement rotate around the deep opening in the movement once every five minutes, but it also rotates on its own axis once per minute. Around the edge is a fluted ring, further setting it off from the rest of the movement. It's hard to tell much in still images like this, but I'm willing to bet it's hypnotic (if Cartier's track record is anything to go by, that is). It's worth mentioning that this complication was first developed by Cartier in 2013, and this is just the latest execution.