The front, visible cog in many Swatches.

I've found it very difficult to find the answer to this online as there is actually very little information about Swatches beyond what's for sale etc.

I have noticed many current Swatch designs that show the inside parts make use of the prominent internal cog, that is present on the front face, at about 8 o clock. Sometimes adding a different shape to it, sometimes highlighting it with color. I have even seen some designs where the shape of this cog is referenced somewhere else on the design. I have 2 questions that perhaps somebody who owns a Swatch could tell me:

1. Does this cog rotate? 2. Does this cog have an integral function for the mechanism of operation? Or is it just decorative?

Many thanks in advance.