Shape constancy in pictorial representation

When one looks at a picture from an oblique direction, its retinal projection is foreshortened, but this distortion in proximal stimulation is usually not perceived. A correction akin to shape constancy takes place. Experiments are reported that show that this correction can be the result of compensation that takes the slant of the picture plane relative to the line of sight into account. When deceptive cues for the orientation of the picture plane were provided, the perceived shape in the picture conformed to a compensation based on the deceptive cues.