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Why is this not a thing already?
You rock the chair.
The chair generates electricity enough to light the book you are reading, or play a lullaby, or charge your lap-top, or... activate a stopper if a cats' tail is detected.
||Good idea. Need not only be piezoelectric.
||True, thereby bipassing the "just add piezo" rule.
||...or build up sufficient charge to rock the chair
automatically for a little while and save you the trouble
||That I like.
You rock yourself to sleep and the chair rocks you for a while after you've nodded off.