Stainless Steel Rattleback - can only be spun counter clockwise
It's an asymmetry in weight along the left and right symmetry axis..that induces an instability... the vibrations end up causing friction, precession and the instability transform rotational energy into the rattling (basically oscillations) that end into rotational energy in the opposite direction.
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☮️ In loving memory of Patrick♥️
http://jhenrystuhr.tributes.com/obituary/show/Patrick-Lee-Archibald-108506367