In Elector:
"It's a ten-meter-diameter metal globe, spiral staircases and escalators connecting it to the seven spheres at the corners of an octahedron that make up the former centerpiece of the 1950 World's Fair."

An octahedron has eight faces but only six vertices.

Also, is "octahedron" a correct description of the Atomium? According to what I've found on-line (http://en.wikipedia.org/wiki/Atomium) the Atomium is a cube with a central sphere connected diagonally to 8 spheres at each corner. It's supposed to represent a "body-centered cubic" iron crystal.