Magnet in G5 (non-iSight) iMac case top?

I have the iMac model shown below, with no built-in camera. I just bought an XBox 360 "Live" USB camera to use with iChat -- thanks to the 10.4.9 upgrade, it is plug & play.
Naturally, I set it on top of the iMac. When I did so, I discovered something I had never noticed before: there is a strong magnet somewhere near the center of the iMac's case top. This is not a problem; in fact, it helps keep the camera from falling off. The magnet is not in the camera, since it is easily felt by sliding a paperclip or other small metal object along the top of the iMac case.
I just wondered if anyone else had noticed this, or knew why it was there.

Thank you Miriam & DaddyPaycheck for your replies!
I suspected the magnets (there seem to be two) might be for iSight mounting, but I don't believe this is mentioned in any Apple documentation I can find, either for my iMac or in the online iSight User Guide. From what I can tell, the latter reference suggests only the adhesive "Flat-panel display and flat-panel iMac mount" for use with the G5 iMacs.
Odd that this feature of these iMacs wouldn't be mentioned, since the magnets might present an unwelcome erasure hazard for anyone still using (for example) floppy or Zip disks, or for an iPod inadvertently set on top of the case.
DaddyPaycheck, which mount did you use with your iSight camera? Not having one, I'm not familiar with the mounts other than from the online manual, which seems to indicate the "Magnetic display mount" is the only one that would be grabbed by the magnets. Does another mount have enough iron in it for the magnets in the iMac to grab it securely?
It's a pity Apple discontinued the stand-alone iSight camera -- there is still a demand for them, as shown by the prices used ones fetch on eBay -- more than they originally cost new! I haven't seen anything else comparable, particularly anything with an autofocus f2.8 lens or full OS support -- the now-supported USB webcams work with iChat, QuickTime Pro & Broadcaster, but not with iMovie. Plus, only QuickTime Broadcaster allows any adjustments (tint, saturation, etc.) with these webcams.
Oh well. At least those of us without an iSight can now use some cheap webcams with a few Apple apps.

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