Hope you took your Dramamine.
These aren't just magnets in motion. These are a kaleidoscope of Neodymium Rare-Earth Magnets in bright colors and various shapes COMING AT YOU QUICKLY FROM EVERY DIRECTION, which means that you're most definitely going to get motion sickness if you stare upon them too intently.
So don't. Avert your eyes every now and again. You also shouldn't try to read while playing with them, because we hear that can make it worse. And don't go swimming for at least 30 minutes after use, or eat ones in an ambrosia salad that's been left out in the sun for four hours or longer.
Also don't take candy from strangers wearing pants made of these. There. That should cover it.