Stairways are one of the most tightly regulated parts of a building, and at first glance, each of these stairways violates US building codes. EXCEPT the white one on the top and the one with the slide. I don't think there is a section of the building code that covers slides. But I wouldn't put a slide next to a massive window like that unless the window was tempered glass.
I love most of these staircases though.
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