camera obscura

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cam·er·a ob·scu·ra / əbˈskyoŏrə/ • n. a darkened box with a convex lens or aperture for projecting the image of an external object onto a screen inside. It is important historically in the development of photography. ∎  a small round building with a rotating angled mirror at the apex of the roof, projecting an image of the landscape on to a horizontal surface inside.

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