Abstract
Descriptions of the inspection of painted surfaces, of domestic cleaners for noise, and the surface of castings, are used to illustrate the suggestion that prolonged perceptual interaction with a restricted range of objects produces now figure-ground experiences in the inspector. The paper discusses the observation that the inspector learns to recognize a wide variety of secondary cues as relevant to his task, and is thus enabled continually to adjust his perceptual ‘ set ’ to optimise his performance. This perceptual development is compared with that experienced by a subject during prolonged viewing of a distorted room.

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