"stevenvh"  wrote in message
<web.498adc8f39783190c0721a1d0@news.povray.org>:
>> In fact, if the radius is less than sqrt(2), there is no "cavity" at all,
>> since the spheres on the diagonal of a face do not intersect.
> Well, they do intersect,

The ones on diagonally opposed vertices do not.

>			   but they "cavity" isn't a closed volume, i.e. it's open
> to the six sides of the cube.

Which is not a cavity in the proper sense.

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