The shading between chronologies indicates that chronolgies can be included as cells in chronologies that are ten times longer, and that each cell within a chronology can be subdivided into its own ten cell table.  The one exception are cells within graphic decades, which can subdivided into 12 cell monthly calendars having 4 rows and 3 columns.

The reason that the cells are not numbered one thru ten is that both ten and one begin with the numeral 1. The ten numbers that begin with one, the teens, are all in one cell, as are the twenties and the following decades of each century. The zero decades are called the ohs, as in nineteen oh one 1901, which we say occurs in the nineteen ohs, rather than in the nineteen zeros.

As the last chronology on the right indicates, only two of the 1,000 year long cells in the 10,000 year Common Era Chronology have occurred. The third 1,000 year cell began in the year 2,000 and we are currently in the 3rd decade of its 1st century.