This abstract is as much about color as about light, with its corals and pinks, plus those captivating jewel tones of aqua. There's the stretch of bay, wonderfully blue, the sand's gentle dune, the green carpet path along the boardwalk, that welcoming shade beneath the pavilion. Hot sun and tang of salt are in command. Most viewers will recognize this one. Mr. Koch's composition is masterful, his technique important.
Shadow carries much of the mood here.
I refer to this as semi-abstract because land and water themselves form bars of color and light, just as does this gentle oil on linen. The colors, by the way, could cool any summer day. None of the above. The mood is snow, not sun. But, subtly, light is everywhere.