  The reference in the discussion of the Mode of Relativity (Ι 167) is a reference back to PH I 39 where Sextus tells us that all Ten Modes of Aenesidemus can be put under the generic heading of ‘relativity’ (not to be confused with the eighth of the Ten Modes, also known as the Mode of Relativity—although it seems as though Sextus himself made precisely that confusion; Annas and Barnes 1985: 142–3; for more on this difficult mode, see Brennan and Lee 2014). So one of the Five Modes is an umbrella mode for all of the Ten Modes, which, as we have seen, were best thought of as devices for generating equal and opposing arguments to arguments put forward by dogmatists which depend upon how things are perceived in this or that situation.