1.   Layers of spheres in the square formation can build up to form the body-centred cubic structure.

2.   Each sphere in a body-centred cubic structure is at the centre of a cube with spheres at each corner.

3.   The caesium chloride structure, for example, consists of a cubic structure of cations and a cubic structure of anions.

4.   Together they form two interpenetrating body-centred cubic structures.

5.   Together they form two intersecting face-centred cubic structures.

6.   The zinc blende type of structure has a face-centred cubic structure.

7.   If we view this as a cubic structure of cations, then the anions have a tetrahedral structure inside the cube.

8.   Alternatively, if we view the anions as the cubic structure then the cations have the tetrahedral arrangement.

9.   It has a face-centred cubic structure.

10.   Pilgrims will also circle the Kaaba, a cubic stone structure in Mecca, to which Muslims around the world turn for prayer.