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I'm not sure what the easiest way to do this would be -- maybe
the rockers be made from metal that is bendable but retains its
shapr, and then have multiple variable fulcrums (fulcra?) behind it
bending it so that it is either more rounded in the middle and
towards the ends or
the other way around, or a more complex
combination of those, or variable in real time automatically (to
the chair rocking for a simple example). Another example would
be to make each of the variations just beyond the steep-enough-to
interrupt-the-rock-point for a massage-rock effect ---
brupupupupup. This maybe could have a Segway gyroscope in it.
Of course if this got really good it would move you around the
floor with either inch-worm-like or skate-boarding-click-clack/ski-
[normzone, Oct 31 2012]
||This would be a wonderful museum exhibit. One would need all the different rockers to be durable and usable. One could invite multiple artists to contribute their take on the rocking chair.
||// metal that is bendable but retains its shapr //
||A couple of leaves from a light-duty trailer spring are
exactly what you're after.
||A pair of trained snakes?
||You might be able to do this with adjustable counterweights, rather than changing the actual curvature of the rocker.