We can't go anywhere without passing a road-side stand, a fair, store or whatever selling these. My husband asked, "what do they do?" I said, "It's a toy and does nothing but kill more time as a distraction in one's day. Just what people don't need."
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You're right - it might help some to focus or relax, but it can also distract others.
Anyway, it doesn't have a lot of purpose! The trend will be over fairly quickly.