Ultramarine Diamond

On a recent visit to the Phillips Collection in Washington, I found myself mesmerized by this painting dated 1967. It was by Jack Youngerman. Was it the depth of colour, the vibrancy, the symmetry, the clean shape? Was it that I saw a wonderful floor to a modern pavilion, a mural, a rill, a grass parterre? Only hours before I had been researching the garden archives at Dumbarton Oaks where so many wonderful ideas were executed to the highest degree.