Seven years ago, Richard Mille took inspiration from something that has fascinated humankind for centuries, the human skull, and made it the centerpiece of the RM 052 Tourbillon Skull. The shape of the skull served as the top bridges, hiding the entire movement behind it. It was suspended in the middle of the case, almost like a mystery watch, being only connected to the case by four bridges. This created the effect of bones and skull, much like a pirates flag. Richard Mille went even so far as also to sculpt the back of the skull, which served as the movement's center bridge. With the introduction of the RM 52-06, Richard Mille continues to play with this concept, yet now it is not a skull, but a mask that takes center stage.