The Isosceles Dodeca and OCTA B-mods are equal volume entities which define the A and B mod domains in an allspace packing of Rhombic Dodeca2. The Isoceles Dodeca is comprised of 48 A-mods and there are 48 B-mods in the OCTA form at the core of the RD. This movie shows 8 Isosceles dodeca nested into the concave octants of this OCTA B-mods core form. Note that the outer shell form defines the VE and could be packed with OCTA B-mod assemblies ("octabods"} then more Isosceles Dodeca ad infinitum into allspace.. The OCTA B-mod assemblies ("octabods"} are contiguous in this packing.