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   camera obscura

   /ˌkam(ə)rə(r) ɒbˈskjʊərə/

   noun

   • 1. a darkened box with a convex lens or aperture for projecting the image of an external object on to a screen inside, a forerunner of the modern camera.
   • ▪ 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.

   Word Origin early 18th century: from Latin, ‘dark chamber’.

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