Half a croissant, on a plate, with a sign in front of it saying '50c'
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Strap *this* to the back of your cat.

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Pool Balls With Gyroscopes Inside

Be all like, physics 'n stuff.
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Not sure what the game would be like, different certainly.

Maybe the harder you hit them the faster the gyroscopes spin or something.

doctorremulac3, Sep 25 2024

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       Depends... is the "outer shell" free-floating", or is the axis of the gyroscope fixed to the shell?
If the axis of the gyro is known (since balls have stripes, that is a reasonable assumption), using precession would be possible, but it would be very difficult to get a particular ball to finish it's move with the gyro in a useful position for the NEXT move.
Another problem is how to spin up the gyros initially. I thought "magnets" but then the magnetic fields would interact, which may-or-may-not be a good thing... Maybe split the ball in half, spin up with airjet/whatever, then lock the halves of the shell back together.
But I like it! Find a 3D printer & make a few balls to experiment.
neutrinos_shadow, Sep 25 2024
  

       I was thinking external magnets and the axis being free floating. But "thinking" might be over selling the process here.   

       I'd try different approaches to them being attached or free floating, but having a rack that uses magnets to spin them up would be the way to do that part.
doctorremulac3, Sep 25 2024
  
      
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