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We measure the mass functions for generically red and blue galaxies, using az < 0.12 sample of log M* > 8.7 field galaxies from the Galaxy And MassAssembly (GAMA) survey. Our motivation is that, as we show, the dominantuncertainty in existing measurements stems from how 'red' and 'blue' galaxieshave been selected/defined. Accordingly, we model our data as two naturallyoverlapping populations, each with their own mass function and colour-massrelation, which enables us characterise the two populations without having tospecify a priori which galaxies are 'red' and 'blue'. Our results then providethe means to derive objective operational definitions for the terms 'red' and'blue', which are based on the phenomenology of the colour-mass diagrams.  Informed by this descriptive modelling, we show that: 1.) after accountingfor dust, the stellar colours of 'blue' galaxies do not depend strongly onmass; 2.) the tight, flat 'dead sequence' does not extend much below log M* ~10.5; instead, 3.) the stellar colours of 'red' galaxies vary rather stronglywith mass, such that lower mass 'red' galaxies have bluer stellar populations;4.) below log M* ~ 9.3, the 'red' population dissolves into obscurity, and itbecomes problematic to talk about two distinct populations; as a consequence,5.) it is hard to meaningfully constrain the shape, including the possibilityof an upturn, of the 'red' galaxy mass function below log M* ~ 9. Points 1-4provide meaningful targets for models of galaxy formation and evolution to aimfor.

Galaxy And Mass Assembly: Deconstructing Bimodality - I. Red ones and blue ones