Why one odd spoke?

Sorry if this is a silly newbie question, but...
I've been looking at a new bike specced with Campagnolo Vento wheels. Noticed that all except one spoke on each wheel are black aero spokes. However each wheel has one round silver spoke. Why is this? I had two novice thoughts 1) that this is the spoke you attach the sensor magnets to, or 2) is it to ballance off the valve?
Thanks in advance
I've been looking at a new bike specced with Campagnolo Vento wheels. Noticed that all except one spoke on each wheel are black aero spokes. However each wheel has one round silver spoke. Why is this? I had two novice thoughts 1) that this is the spoke you attach the sensor magnets to, or 2) is it to ballance off the valve?
Thanks in advance
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Posts
I know Mavic tend to have an odd spoke in their wheels - I thought it was purely a style thing - I could (and often am) be wrong
If it is for the "look", then I'd prefer them all to be the same!
e.g. http://shrani.si/files/dsc01060vv1b.jpg
http://app.strava.com/athletes/30000