- the logistics of stirring (Lotus' Law of Directionality) + stirring clockwise preserves properties - this is because of the relation to clocks and time (and is also a cultural thing; in other cultures other directions or mthods may work better if they have other ways of tracking time or writing for example); clockwise is the way time moves on a clock and thus stirring clockwise preserves the current potion in time. - it makes a potion "more itself" - you stir clockwise before adding non active ingredients; it dilutes the effect they have on a potion overall + stirring counter clockwise to dissolve properties - it makes a more open to accepting new properties, which is why you stir counter clockwise before adding active ingredients