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Konkle and Oliva (in press, Journal of Experimental Psychology: Human Perception and Performance) found that the preferred (‘canonical’) visual size of a picture of an object within a frame is proportional to the logarithm of its known physical size. They used within-participants designs on several tasks, including having participants adjust the object's size to ‘look best’. We examined visual size preference in 2AFC tasks with explicit aesthetic instructions to choose: “which of each pair you like best”. We also used both within- and between-participants conditions to investigate the possible role of demand characteristics. In experiments 1 and 2, participants saw all possible image pairs depicting the same object at six different sizes for twelve real-world objects that varied in physical size. Significant effects of known physical size were present, regardless of whether participants made judgments about a single object (the …