The Phoenix is a minimalist approach to brewing coffee based on fundamentals of geometry, physics and chemistry. It is a framework to support a paper filter. The paper filter and the Phoenix together create the geometry of the brew column. The geometry of the brew column is a key element in the coffee brewing process. By changing the shape of the brew column you will alter the characteristics of the coffee that is brewed through it.
The brew column also serves as a filter. As the water moves through, coffee matter is carried downward. Most of the non-soluble matter is eventually trapped within the column, therefore acting as the primary filtering mechanism for the brew. The taller the brew column, the more non soluble coffee matter will stay in the brew column, resulting in higher cup clarity.