Playfully modeled after the curved and shiny metal aesthetic of circular UFOs, this Beach Rock Resort treehouse is perched precariously at a splayed juncture of branches high up in a Japanese forest canopy. (Image by Andrea Noti)

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Kobayahsi Takashi (perhaps seriously, perhaps jokingly) wanted to build something that could act as a beacon for alien life – a residence high and bold, standing out against the night sky. (Image byKawetijoru)

A series of wooden platforms and staircases wrap a central truck, depositing temporary dwellers into this sky-oriented display case for extraterrestrial perusal. (Image by Pete Nelson)