camera obscura
noun
cam·era ob·scu·ra
ˈkam-rə-əb-ˈskyu̇r-ə
ˈka-mə-rə-
: a darkened enclosure having an aperture usually provided with a lens through which light from external objects enters to form an image of the objects on the opposite surface
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Merriam-Webster unabridged
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