Harshness of the Cosmic Wind
The random directions and speeds of BSP throughout space may produce clusters within a small volume of the universe. I propose that the cosmic wind is a harsh environment that tends to preserve or "break up" structures according to the natural criterion of survivability. The harsh environment has restricted the number of forms that have survived the creation process at various levels. A well-known result of the "critical" selection process is that of the elements of the periodic table.