These two compounds are well known :

Octahedron - Cube

Icosahedron - Dodecahedron

               Do you know these two compounds?

Octahedron - Dodecahedron

Cube - Icosahedron

               Do you understand these two constructions?

Cube - Dodecahedron - Octahedron - Icosahedron

Cube - Dodecahedron - Octahedron - Icosahedron - Compound FS

                              For more information you may have a look at :

                              Compound FS - 1

                              Compound FS - 2

                              Compound FS - 3

                              Compound FS - 4

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