Starck O-Ring Watch

I've had this watch for two years now, so its a little beat up but recently I've been getting a lot of comments on it. I've perfected the explanation of how it works to under 15 seconds now, depending how quick the person is to catch on.

Me wearing the watch :)

Some better pictures of how it looks, found on a Watch website: Watchismo.

It might be surprising but I never noticed how different this watch is from normal ones.