It's not quite what you expect to see at the beach. A circle of 25 big black boxes, each 8 feet by 8 feet, with impromptu "boardwalks" inside and outside the perimeter, though passers-by can certainly walk in the sand if they choose. Embedded in the boxes are photos depicting frozen moments in extreme-sports action, approximately 4 feet by 6 feet, two for each box. After the sun goes down, and some preliminary words are uttered by a man with a microphone (at least 50 percent of which are inaudib
