"Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote:

Rich Grise fired this volley in news:im6728
:

Is the defining attribute to qualify as a "Turner's cube" simply the
fact that it's cubes within cubes with thru-holes?

No, it's that the multiple cubes within cubes be free from one-another,

You mean they could be twirled around inside the outer cube, like that
Boy Scout whittling project with the ball in the cage?

Thanks,
Rich