solid 1 that the axis 30 which joins the two diagonally opposite vertices 15 and 18 is parallel to horizontal edges 7 8 9 and 10 of the rectangular solid 1 and that the axis 29 which joins the two diagonally opposite vertices 17 and 19 is parallel to horizontal edges 11 12 13 and 14 of the rectangular solid 1 the faces defines by vertices 19 20 15 25 by vertices 15 24 17 16 by vertices 17 28 18 27 and by vertices 18 22 19 26 are parallel to axis 31 and are located in planes which forms forty five degree angles with the longitudinal edges 7 8 9 10 and with latitudinal edges 11 12 13 14 of the rectangular solid 1 referring now more specifically to fig3 through 8 it can be observed that the building block ressembles the agglutination of one hundred eight polyhedral elements although the number of elements can be varied and arranged in different combinations the arrangement illustrated in the drawing appears to be the most practical the elements are positioned in three interlocking strata 33 34 35 each stratum comprises six interlocked rows 36 through 41 each row includes six dodecahedral elements joined at opposite vertices it follows that in the building block 1 the second largest dimension edges 11 12 13 and 14 is a multiple of the smallest dimension edges 3 4 5 and 6 and that the largest dimension edges 7 8 9 and 10 is a multiple of the second largest dimension transversal holes 42 43 44 45 46 may be provided through the center of the various faces to engage the building block on.