  Natural symbols such as water (e.g., chs. 8, 78) further reinforce the sense of yielding and deep strength that characterizes nonaction. The low-lying and fertile valley (e.g., chs. 28, 39) accentuates both the creative fecundity of Dao and the gentle nurturance of its power. Carefully crafted and ornately decorated objects are treasured by the world, and as such can be used as a powerful symbol for it. In contrast, the utterly simple, unaffected, and seemingly valueless pu, a plain uncarved block of wood, brings into sharp relief the integrity of Daoist virtue and of the person who embodies it (e.g., chs. 28, 32). Finally, one may mention the notion of reversal (e.g., chs. 40, 65), which suggests not only the need to “return” to Dao, but also that the Daoist way of life would inevitably appear the very opposite of “normal” existence, and that it involves a complete revaluation of values.