To see the real power of goal-based concepts, consider a purely mental concept such as “Things That Can Protect You from Stinging Insects.” Instances of the category are remarkably diverse: a flyswatter, a beekeeper’s suit, a house, a Maserati, a large trash can, a vacation in Antarctica, a calm demeanor, even a university degree in entomology. They share no perceptual features. This category is clearly and entirely a construction of the human mind.
