I don't get it either. My boys have them. The first two I bought broke within a week. The inner part pops off and the ball bearings spill out. I bought higher end ones, too. They are all the rage. #1 spins it and tosses it up and catches it while still spinning. They do "tricks" with them. It's replaced the bottle flipping rage.
A flock of flirting flamingos is pure, passionate, pink pandemonium-a frenetic flamingle-mangle-a discordant discotheque of delirious dancing, flamboyant feathers, and flamingo lingo.
For kids with autism or ADHD, this gadget is great for helping them to focus and stay on task. I know of several families that gave this to their kid to use in school. Granted, they were kids with disabilities, but the parents and teachers I know say the toy does work for the autistic/ADHD child. Their behaviors are reduced significantly.
Everyone else is just along for the ride. ;)
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they exercise multiple parts of your brain simultaneously--you can shift your focus from the individual blades to the spaces between them as they spin and get a clear understanding of rate vs speed(in motion) as well as improve your depth peception as you look THROUGH the blades to another object as the blades turn--also a visible example of why wheels/propellers/etc. appear to spin slowly/in reverse when filmed/shot/projected then presented on a two dimensional screen for various motion picture formats
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