charlieb wrote:

Does adding actual, as opposed to implied, movement to some pieces seem
a good idea - or just a gimmick?

I like stuff that moves. When I was a child, tops were favorite toys. Then
gyroscopes. Then in my first 'real' art class, a mobile. I particularly
like stuff that moves without human intervention, like mobiles and wind
chimes and something like your rocking box, if it is light enough to be set
in motion by the breeze from a passing person.

Can it start moving without your help?