 In subsequent discussions, this argument received much attention (see Ayer 1940: ch. 1; Robinson 1994: ch. 2; for an overview, Smith 2002: ch. 1). In contrast, when Russell, Moore, Broad, and others spoke of Perceptual Variation and the relativity of perception, they did not treat the elliptical appearance of a penny as illusory. They simply affirmed that, from various positions, the penny looks elliptical even though it is actually round. Further, although they may have alleged the phenomenal indistinguishability of illusory appearances, such as the bent appearance of a stick partially submerged in water, when compared with ordinary appearances, this was not the basic argument for sense data. Their basic argument came from Perceptual Variation and the lack of a match between the penny as it appears and the penny as they believed it to be physically.