| abstract | - Throughout Rapture there are numerous holes in the wall surrounded by metallic fixtures. These vents allow Little Sisters access to all areas of the city so they can collect valuable ADAM from corpses. The Little Sisters are the only thing small enough to fit into these vents and crawl through them, therefore they can use them as a means to safely move around the city without a Big Daddy. Big Daddies are always awake and vigilant. When they do not have a Little Sister with them, they roam to the nearest vent and pound on its rim. The noise summons a Little Sister out. When the Little Sister is tired of or finished gathering ADAM, she goes back to the vent and the Big Daddy usually helps her up into it. The design of the metallic plate, which includes stylized leaves and plant stems, insinuates that the vents may all lead — possibly through a pumping system — to Arcadia, transporting oxygen and carbon dioxide to and from them. Some areas of Rapture contain vents that are in disrepair with water flowing over or out of them. The Little Sisters were conditioned to use these vents by educational posters in the Little Wonders Educational Facility in Point Prometheus. However, the names of the vents were simplified to seem more innocent and/or friendly, as they are nicknamed, 'Hidey-Holes.'
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