Borg Cubes coming in multiple sizes?

[NCC-73515]

But he was on a cube! Or was he in a sphere within that cube? Do all cubes have spheres?

 

[Prax]

They must! And then the sphere has a diamond inside

 

[NCC-73515]

Which has a coffin/probe in it.

 

[Kamen Rider Blade]

The Borg are not Nested Russian Dolls!

 

[David cgc]

But he was on a cube! Or was he in a sphere within that cube? Do all cubes have spheres?

In "Greater Than the Sum," Christopher L. Bennett proposed that Borg "cubes" actually have a spherical central hull for efficiency reasons (and, yeah, probably to account for First Contact showing the inside of the BoBW cube was a giant donut), and the "cube" part is all superstructure, which is why you can see through the lattice a bit, though not all the way.