The function f(x) seems to be selective for concepts related to events, landmarks, or objects associated with France or French culture. Examples include the Eiffel Tower and Tour de France scoring high values. Additionally, it identifies particular objects like helmet and glasses, and textual concepts like text, but it doesn't seem to be the main focus. Overall, f(x) is mainly selective for concepts related to France or French culture, as well as some specific object and text-related concepts.