in Thoreau’s Journal:
It is pleasing to behold at this season contrasted shade and sunshine on the side of neighboring hills. They are not so attractive to the eye when all in the shadow of a cloud or wholly open to the sunshine. Each must enhance the other….
Above all there is the Cardinal flower just opened––close to the water’s edge––remarkable for its intense scarlet color––contrasting with the surrounding green….It has been a clear cool breezy day for the season.