From time to time I check out definitions of psychological terms. What I have noticed is that the definitions tend to be circular, self-referential. “Impulse control disorder” is what comes up for “impulse to manipulate.” While the search term suggests a subject and an object, the object is implied to be the subject in the definition. The relationship between the actor and the thing acted upon is left out. Is binary thinking the result of not perceiving connections, missing links? I wonder how prepositions are dealt with in other languages. Latin, of course, is additive, appending prefixes and suffixes to indicate direction.