Commentary for Avodah Zarah 91:10
וחזר הדין לא ראי זה כראי זה ולא ראי זה כראי זה הצד השוה שבהן שאין בהן תפיסת ידי אדם ומותר אף כל שאין בהן תפיסת ידי אדם ומותר
Therefore the logic returns, this one is not like this one, nor is it like this cone; their commonality is that they are not the products of manual labor and they are permitted. Consequently anything that is not the product of manual labor is permitted.
Daf Shevui to Avodah Zarah
Neither a mountain nor an animal are the products of human labor, and both are permitted if worshipped. So too anything that is not the product of human labor is permitted. Even boulders attached from mountains.
Ask RabbiBookmarkShareCopy