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Elo comments on Magnetic rings (the most mediocre superpower) A review. - Less Wrong Discussion
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A science museum amortizes the cost of the demonstration across many people, but that only works for short demonstrations. If you need to play with the rings for a week or a month, they don't fit in a museum. But you can amortize the cost of lava lamp with your friends: after you get bored of it, pass it on. This is harder with a ring because of sizing. Also, if they weaken after two months.
I would have said a set or so for 10mins would show you some of the fun stuff, but also should be enough. Heck - a "rent them" sorta policy. two rings, $5 to play, $50 deposit. You can keep the rings but you can also give them back for the deposit.