Create an embeddable geometry of an octahedral set. The 6 are all the same size and fit together perfectly to form a larger octahedron. The object should be rotatable through 360 degrees, when clicked or dragged over (on mobile).
When double clicked the octahedra should open to reveal a glowing ball at the centre.
When the ball is double clicked the octahedra should close to return to its original position.