 The notion of ‘being under the impression that’ played a significant role in the writings of the Oxford Realists, not just those of Prichard, who also spoke of the ‘an unquestioning frame of mind’, ‘thinking without question’ or ‘taking for granted’ (Prichard 1950, 79 &amp; 96–98), but also those of William Kneale, H. H. Price and J. L. Austin—see, e.g., Kneale (1949, 5 &amp; 18), Price (1935), and Austin (1962, 122). Perhaps most strikingly, Prichard was to drop the ‘accretion’ and argue in a late essay, ‘Perception’, that perception is not a kind of knowing: we merely see colour extensions, which we systematically mistake for objects or ‘take for granted’ to be objects (Prichard 1950, 52–68). Still, the notion of ‘being under the impression that’ had its critics at Oxford, such as H. P. Grice, who was aware of the difficulties raised by the ‘accretion’: