 The theory theory is especially well-suited to explaining the sorts of reflective categorization judgments that proved to be difficult for the prototype theory. For example, theory theorists maintain that children override perceptual similarity in assessing the situation where the dog is made to look like a raccoon, claiming that even children are in possession of a rudimentary biological theory. This theory tells them that being a dog isn’t just a matter of looking like a dog. More important is having the appropriate hidden properties of dogs—the dog essence (see Atran &amp; Medin 2008 on folkbiology). Another advantage of the theory theory is that it is supposed to help to explain important aspects of conceptual development. Conceptual change in childhood is said to follow the same pattern as theory change in science.