Metal and Rust
Metal
: An element of Nature. One of the five dividers of time.
Elements are basic principles or building blocks of which all things are composed.
The fourth element is metal; the nature of metal is to yield and change.
Metal shrinks inward and is hardened and moulded by other natural elements, like water and wind.
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Interpretation of the elements derived from Chinese, Tibetan and Indian philosophy.
Source: THE SHU KING, Or Book of Historical Documents. Translated by James Legge