  A further issue concerns the kind of contents to be found within individual specious presents. Foster, himself a leading realist of the Extensional persuasion, writes: ‘duration and change through time seem to be presented to us with the same phenomenal immediacy as homogeneity and variation of colour through space’ (1982: 255). Broad remarks: ‘There is no doubt that sensible motion and rest are genuine unanalysable properties of visual sensa. I am aware of them as directly as I am aware of the redness of a red patch.’ (1923: 287) Broad and Foster are committed to the following general principle: