Different grinds of the same spice in the same dish.
By using multiple grinds/textures of the same spice you get a longer more developed flavor. Finer grind upfront while coarser grind lingers across the chew.
I started using this technique with black pepper in BBQ rubs a few years ago and have since expanded the idea with other spices/cookery styles. Its not unlike the idea of using multiple types of hot peppers that hit your palate differently, cayenne sharp upfront, guajillo subtle backnote, but with the same flavor/spice.