I liked working with the small boxes of colored stones of which that weekend there was an abundance. All kinds of beautiful stones/cobbles had washed up in a huge skirt along the beachfront. Colors in many variations. In the time I had, I managed to cage four different species and would have loved to continue, but the next week the cobbles were gone, along with the artwork, replaced by the grey stone discs, which led to some flower/lotus/artichoke shapes.
Along with the discs a nice carpet of sand was laid down, which is essential for embedding the discs and holding them in place. See how cooperative the lake can be when it wants to be? In exchange it removed the great raft of sticks that had washed up earlier, which I had my eyes on for the next project.