While taking a walk on the promenade, saw a few folks cleaning up the floor of the restaurant on the beach. But their sweep movements were making a little more noise than I would have assumed. Upon closer inspection, I noticed that they were sweeping away stones and small rocks. The beach here in Nice is not sand but a lot of small rocks. Overnight, the tide brings in all sorts of stones to the restaurant floor. And then every morning, the staff clears them out!