If your day pillar’s stem is Geng, your Day Master is Yang Metal — image of raw ore fresh from the ground and the blade before its final edge: strong, unshaped, full of possibility and friction. This guide reads the classical imagery and how it is used for reflection.
Geng is Metal in its Yang phase, the seventh Heavenly Stem, fixed by the calendar: a birth day whose stem is 庚. The chart then reads like a forge: what fuels it (Wood), what hammers it (Fire), what cools and shapes it (Water), and how much of each is present.
Raw metal is strength before refinement: the ore that becomes a tool, a bell, a blade. Classical commentary praises Geng for decisiveness and a plain sense of right and wrong — metal cuts clean — while warning that unrefined strength cuts carelessly. The whole art of a Geng life, in the texts’ imagery, is the forging: heat, hammer, and quench that turn hardness into edge.
Yang Metal is read against its forge. Fire is the classical teacher of Geng: heat that shapes rather than melts, hardship that forges rather than breaks. Water gives the quench — clarity, polish, articulation. Wood feeds the furnace. The balance of these in your chart describes, symbolically, what kind of forging your strength has been getting.