What have I seen attached to someone's wheels?

Hi all - first post, after a long time lurking.
I followed a rider today while I was driving in and noticed that he had some strange contraptions inside his spokes, front and rear. I couldn't get a good look as I didn't get a chance to see him stationary, but there were two curved strips per wheel, around 4-6 inches long and sitting around 6 inches out from the hub. They were black and looked to be plastic, but not 100% sure.
I did see that he had a normal bike computer magnet on his front fork, so I'm stumped.
Any ideas what they were?
I followed a rider today while I was driving in and noticed that he had some strange contraptions inside his spokes, front and rear. I couldn't get a good look as I didn't get a chance to see him stationary, but there were two curved strips per wheel, around 4-6 inches long and sitting around 6 inches out from the hub. They were black and looked to be plastic, but not 100% sure.
I did see that he had a normal bike computer magnet on his front fork, so I'm stumped.
Any ideas what they were?
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to power the axle mounted LED.
Parktools :?:SheldonBrown
You! Out! Now! :roll:
Parktools :?:SheldonBrown
What's up? I quite like the idea of some old school dynamo lights!
Good point, well made. I'll try to get a closer look if he slows down enough for me to catch him if I see him when I'm on my bike.
http://www.youtube.com/watch?v=Bzef_xPWuTg
and they do do bar mounted kits.
http://reelight.com/
Parktools :?:SheldonBrown
Only kidding. Me too, but I was afraid you might be drawn towards the dark (bling) side with light-up wheels.