Rhombic dodecahedral honeycomb

It is well known that one can tile the space using the rhombic dodecahedron as a unit cell. The resulting structure is the so-called the rhombic dodecahedra honeycomb.
Check wikipedia,http://en.wikipedia.org/wiki/Rhombic_dodecahedral_honeycomb, for more discussion.

I made a physical model of this structure with beads during the spring break.