This year’s winners of the eVolo Skyscraper Competition have been announced. Featuring fantastical skyscraper designs, highlights include rotating affordable housing, an ocean-cleaning plastic skyscraper, and tree-like towers to help keep watch over the Amazon rainforest.

The eVolo Skyscraper Competition doesn’t concern itself with mundane practicalities like planning permission, building cost, budget or safety, but is laser-focused on highlighting interesting ideas and sparking the imagination. There’s no official overriding theme this year, but the specter of climate change looms large.

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“eVolo Magazine is pleased to announce the winners of the 2023 Skyscraper Competition,” said eVolo. “The Jury selected 3 winners and 15 honorable mentions from 309 projects received. The annual award established in 2006 recognizes visionary ideas that through the novel use of technology, materials, programs, aesthetics, and spatial organizations, challenge the way we understand vertical architecture and its relationship with the natural and built environments.”

Read more: New Atlas