The number of the cellular Polyhedra is determined by the number of centres of diffusion.
"The Mechanism of Life"
Stéphane Leduc
All pack tight, and mould their surfaces against each other, so that in the long run there is a wonderful average uniformity in the forms of both thoughts and actions, just as you find that cylinders crowded all become hexagonal prisms, and spheres pressed together are formed into regular Polyhedra.
"The Complete PG Works of Oliver Wendell Holmes, Sr."
Oliver Wendell Holmes, Sr. (The Physician and Poet not the Jurist)