Ethos/Will is the Causal Circuit — directed intention. This is where perception becomes purpose. The signal received at Cosmos/Light acquires a direction at Ethos/Will — it becomes pointed at something, aimed, focused. In chaos magick terms this is the moment of sigilization: the raw intent, before it has been filtered through Mind or colored by Heart. Spare's method works at this level — stripping the intent down to its bare directional impulse and encoding it before the Egoform's interpretive machinery can capture it. The Throat circuit: the focused impulse that initiates the cascade downward into manifestation.
Will entering Mind — directed intention taking the form of ideas, plans, and frameworks. The impulse becomes thinkable, articulable, mappable. This is where the creative process becomes conscious.