Attribuée à Zhuangzi (Tchouang-tseu), philosophe taoïste chinois du IVe siècle av. J.-C. Tirée probablement du 'Zhuangzi' (ou 'Œuvre de Maître Zhuang'), chapitre sur 'L'Adaptation au Monde'.
"Forms and things manifest themselves to one who is not attached to their own being. In movement, they are like water; in rest, like a mirror; and in responses, like an echo."