   The next of Reid's objections is more involved, requiring introduction of a key distinction Reid makes on the basis of his attention to the phenomenology of visual experience. First, though, notice Hume's use of the term ‘table’ and ‘the real table’ in the argument above. Following Berkeley's New Theory of Vision, Reid distinguishes between visible figure from tangible figure (IHM 6.2, 81–2), or later, which is virtually the same distinction, between ‘apparent magnitude’ and ‘real magnitude’ (EIP 2.14, 181). The tangible or real figure of an object is measured by yards or inches, but the visible figure is not. Instead, the visible figure depends for its geometric properties—the surface area that the table occupies in the visual field—upon properties of the tangible figure, including its shape and its distance from the eyes. Reid recognizes the obvious phenomenon of perceptual relativity, for example, that when I see a table at 10 yards and at 100, its “visible appearance, in its length, breadth, and all its linear proportions, is ten times less in the last case than it is in the first” (IHM 6.2, 81–2). The tangible figure is measured by different means, sensed by a different faculty, and is extended in three dimensions. This leads Reid to argue that “The ingenious author has imposed upon himself by confounding real magnitude with apparent magnitude,” that is, Hume equivocates (EIP 2.14, 182).