Sculpture in the Garden

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Seen this week on the National Mall. 

Whatever you think of this particular sculpture, I know you'd love the garden that surrounds it -  the sunken sculpture garden at the Hirshhorn Museum.  Can anybody identify the grass?  I'm thinking Stipa.

IMG_0294In another sculpture garden not far away, a huge bank of flowering Caryopteris, with more modern art in the background.IMG_0288