Have just come back from a wonderful four-day trip with friends through Amsterdam, Delft, Bruges & Dunkirk. At one point we stopped at a beach on the Dutch coast not far from Rotterdam amidst tumultuous weather, and I took some pictures of grass on the sand dunes.
I was intrigued by how different it looked in different lights. These shots are of the same type of grass, within a few metres of each other and within two minutes of each other: