in vienna there is a stone collection law, anyone can collect stones, just not in certain ponds or streams or where nature will be damaged, or on foreign soil. i went to a park and saw a black stone, half underground and the other half above ground, it wasn't loose, i took a pocket knife and pulled it out. according to roman law it belongs to me because i plugged the hole with another stone, no danger. service done. is it the golden ass story with lady isis!?