  The Everything-in-Everything principle asserts the omnipresence of ingredients. In everything there is a mixture of all the ingredients that there are: every ingredient is everywhere at all times. This principle is a fundamental tenet of Anaxagoras’ theory, and leads to difficulties of interpretation (see, for instance, the debate between Mathews 2002 and 2005 and Sisko 2005). If everything is in everything, there must be interpenetration of ingredients, for it must be possible for there to be many ingredients in the same space.  Indeed, the principle requires that all ingredients be in every space at all times (the No Smallest or Largest principle also plays a role here: see sect. 2.3). This will allow any ingredient to emerge from a mixture through accumulation (or, having been unmixed, to become submerged in one) at any point at any time, and thus allow for the appearance of coming-to-be (or passing-away) of things or qualities.