imagine a cube. now mark the midpoints of its edges, and cut off all the vertices at those points. shape you have now is cuboctahedron. if look into its cross sections that are regular convex n-gons, you will realize the maximum n here is 8 and overall number of such sections in this shape is 6, each is parallel with respective square face. now shave off all the shit using these cross sections, you will be left with a cube with the side that of 1/2 of the original cube, ie volume of the new cube is 1/8 of the original, which is funny because my cock is exactly 8 time more voluminous than yours.