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In previous research, Konkle and Oliva (VSS-2009) found that the preferred visual size (“canonical size”) of a picture of an object is proportional to the log of its known physical size: Small physical objects are preferred when their images are small within a frame and large physical objects are preferred when their images are large within a frame. They employed within-participant designs using multiple objects in several different tasks, including a perceptual preference task in which they asked participants to adjust the image size so that the object “looks best.” Because of concerns about how the instructions were interpreted (is the image that “looks best” the one at which it “looks most like itself” or the one that is “most aesthetically pleasing”) and possible demand characteristics (the same person seeing multiple objects of different sizes may implicitly feel pressured to make their relative sizes consistent), we studied …