 Now Broad is perfectly clear that the sensum analysis of perception cannot be established simply by pointing to such phenomena as the penny seen obliquely. He does not for a moment suppose that it is possible to logically infer that there is an elliptical sensum from the proposition that something sensibly appears elliptical (pace Barnes 1945, p. 113). What he claims is that there are considerations that can be adduced in support of the sensum analysis. When we look at the penny from the side we certainly seem to be aware of something elliptical. So we certainly seem to have before our minds something that is elliptical. Obviously “we can quite well mistakenly believe a property to be present which is really absent, when we are dealing with something that is only known to us indirectly, like Julius Cæsar or the North Pole” (1923, p. 241; Broad’s emphasis). But there are phenomenological differences between perception and belief (or thought) that seem to call for different accounts of their nature. In perception we seem to be dealing with properties that are presented to us. Consider the case of perceiving a stick half immersed in water. Here