Original art paintings are chosen over their "color-rotated" versions because of changed color contrast.

To assess the relationship between the color contrast values for each image and choices, we regressed the counts or frequency of choice for a specific angle over the levels of contrast of each painting's rotation; this regression analysis revealed positive (see Figure 9 ), moderately significant, correlations (CIELAB: t = 3.9, p = .0002, R 2 = .148; De Valois: t = 6.1, p < .0001, R 2 = .304).

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