Buildings require two different stairways for egress in case one is blocked in the event of a fire. Scissor stairs provide this as a double helix, but the compartments separated by fireproof walls. This allows more light and more living space in buildings, and lower home prices.
Washington State recently became the first state to legalize them since they were banned in the 1970s.
Posted by RandomEngy
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Submission statement: this is relevant to Neoliberal’s focus on YIMBY and affordable housing.