...can be a possible multiple mechanical oscillator design( take a look and formalize the "Performing Seal" of Alexander Calder) versus the certified double mechanical oscillator(take a look at "Mechanical hammer with a physical pendulum").
So,give a look at www.mcachicago.org/Book/Calder-txt.html then at www.veljkomilkovic.com/OscilacijeEng.html compare and think about input action(unbalance) vs. output reaction.
All the Bests! / Alex
....if you take an attentively look,are as from the same "portrait family" in a museum.
One plastic art comes from a new type of mobile sculpture("Performing Seal"-1950-Alexander Calder),as an appeal to think about a possibly new entry for dynamics.
The other (Milkovic),comes as a proof and an incitement to open this new entry.
Maybe,this new approach can help our topic...
All the Bests! / Alex
...is simply a test(and contest,competition) of reactiveness,sensibility for a same basics design,scheme.
For a Milkovic's pendulum with a lever,you must use your hand to push pendulum.
For a Calder's "Performing Seal" , you can read,on the site, that the mobile-stabile sculpture needs no more as "...the slightest breath of air" for a "dance".
So,possibly we have good news:A NEW TYPE OF LEVER(AGE)?!
All the Bests! / Alex