Laozi understood that a big rock represents different things to different observers. To an elephant, it is a good place to scratch one's back. Insects build their homes on it, and trees use it to protect their roots.
「老子一定知道，一塊大石頭，大象用來磨背，昆蟲用來築窩，大樹用來護根，從生物學的角度，萬物往往不會只有單一用途。」