How objects and colors appear is dependent on their context.
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Red appears more brilliant against a dark background and duller against the white background. In contrast with orange, the red appears lifeless and with a blue-green background, it exhibits brilliance.
Notice that the red square appears larger on black than on other background colors.
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The small purple rectangle on the left appears to have a red-purple tint
when compared to the small purple rectangle on the right.
They are both the same color.
This demonstrates how colors can be perceived with different background.
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Would you believe that the two circles in the centre of the left and right figures are identical?
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