Uzumaki horror stories create horror through the idea of obsession. In these stories, characters often become obsessed with spirals. This all - consuming obsession leads to their downfall. It makes the readers or viewers feel the same unease as the characters, as they watch the slow descent into madness. Also, the mystery surrounding the spirals, like where they come from and what they mean, adds to the horror. It's like there's an unknown force at work, and that's always scary.
They use the unique shape of the spiral. The spiral is an unusual and often unsettling shape that can make people feel uneasy. When it's constantly presented in a horror story, it creates a sense of dread.