When I referred to a secondary pattern (may be using the incorrect term), I was referring to that black on-point grid that is formed all over the quilt. The blocks themselves are not on point, but this grid gives the illusion that the quilt is done on point.
As white pine circled above, there is the primary block we construct, and the illusion of a second block created by the sashing and cornerstones.
char, that is really unique and interesting! I just love the colors you chose; beautiful fabrics!