 The prototype theory does well in accounting for a variety of psychological phenomena and it helps to explain why definitions may be so hard to produce. But the prototype theory has its own problems and limitations. One is that its treatment of categorization works best for quick and unreflective judgments. Yet when it comes to more reflective judgments, people go beyond the outcome of a similarity comparison. If asked whether a dog that is surgically altered to look like a raccoon is a dog or a raccoon, the answer for most of us, and even for children, is that it is remains a dog (see Keil 1989, Gelman 2003 for discussion). Another criticism that has been raised against taking concepts to have prototype structure concerns compositionality. When a patently complex concept has a prototype structure, it often has emergent properties, ones that don’t derive from the prototypes of its constituents (e.g., PET FISH encodes properties such as brightly colored, which have no basis in the prototype structure for either PET or FISH). Further, many patently complex concepts don’t even have a prototype structure (e.g., CHAIRS THAT WERE PURCHASED ON A WEDNESDAY) (Fodor &amp; Lepore 1996, Fodor 1998; for responses to the arguments from compositionality, see Prinz 2002, Robbins 2002, Hampton &amp; Jönsson 2012, and Del Pinal 2016).