It is commonly supposed that perceptual representations in some way embed concepts and that this embedding accounts for the phenomenon of seeing-as. But there are good reasons, which will be reviewed here, to doubt that perceptions embed concepts. The alternative is to suppose that perceptions are marks in a perceptual similarity space that map into locations in an objective quality space. From this point of view, there are at least three sorts of seeing-as. First, in cases of ambiguity resolution (such as the duck-rabbit), the schematicity of the figure leaves us with a choice as to where in perceptual similarity space to place a mark (closer to the marks that represent rabbits or closer to the marks that represent ducks). Second, in cases where expertise affects perception (as when, for example, we learn to distinguish various kinds of tree leaves), the accumulation of perceptual landmarks permits a more precise placement of a mark in perceptual similarity space. Third, extensive experience with an object (e.g., the family dog) allows similarity to that object to serve as an acquired dimension in perceptual similarity space, which in turn affects the relative similarities of other objects.
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