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The key to creating useful categories in our homes is to limit the number of types of things they contain to one or at most four types of things (respecting the capacity limitations of working memory). This is usually easy to do. If you've got a kitchen drawer that contains cocktail napkins, shish kebab skewers, matches, candles, and coasters, you can conceptualize it as "things for a party." Conceptualizing it that way ties together all these disparate objects at a higher level.