cardboarding en · NOUN
Etymology
From cardboard + -ing, suggesting flat cardboard cut-outs.
Meanings
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(uncountable) The flat appearance of objects in a scene in the absence of proper depth perception.
Cardboarding may occur on near-by objects, and its appearance is very unpleasant.
1953, Raymond Spottiswoode, Nigel Spottiswoode, The Theory Of Stereoscopic Transmission & its application to the motion picture, Berkeley; Los Angeles; London, England: University of California Press; Cambridge University Press, page 74: