"Radial Categories, with central cases and variations on them, are normal in the human mind."
"1. The central subcategory of a radial category: this provides the basis for extending the category in new ways and defining variations."
"2. A typical case prototype: This characterizes typical cases and is used to draw inferences about category members as a whole, unless it is made clear that we are operating with a nontypical case."
"3. An ideal case prototype: This defines a standard against which other subcategories are measured."
"4. An anti-ideal prototype: This subcategory exemplifies the worst kind of subcategory, a "demon" subcategory. It defines a negative standard."
"5. A social stereotype: this is a model, widespread in a culture, for making snap judgments--judgments without reflective thought-- about and entire category, by virtue of suggesting that the stereotype is the typical case."
"6. A salient exemplar: A single memorable example that is commonly used in making probability judgments or in drawing conclusions about what is typical of category members."
"7. An essential prototype: This is a hypothesized collection of properties that, according to a commonplace folk theory, characterizes what makes a thing the kind of thing it is, or what makes a person the kind of person he is."
"Words don't have meanings in isolation. Words are defined relative to a conceptual system." p29
"Most people don't even know that they have conceptual systems much less how they are structured" p388