Juli and I went to see Five Seasons: The Gardens of Piet Oudolf. I was aware of his garden design philosophy prior to seeing the movie and Juli was not. The picture below shows him in one of his gardens and captures the essence of his design philosphy. Simplistically stated, he gardens for year-round interest and therefore pays close attention to form and out-of-bloom-season performance of the plants he uses.
This is something that native plant gardeners have to cultivate within themselves too: both an awareness of out-of-season look and an appreciation for it.