The bunny has not changed. When its pixel values stay identical but its background changes, the apparent transformation belongs to the visual system, which judges color through relationships rather than treating each patch as an isolated measurement. Context does the work. Against different surrounds, the same pastel fill can seem warmer, cooler, brighter, or duller.
Color is not solitary. The effect is called simultaneous color contrast: surrounding hues can push a patch's perceived color away from their own, so a pinkish background may make a pale bunny look comparatively greener. Brightness plays along, too. A dark surround can make an unchanged patch appear lighter, while a light surround can make it appear darker, although the strength depends on the arrangement. The mechanism resists simplicity. Opponent processing, in which visual signals encode differences along channels such as red versus green and blue versus yellow, helps explain why neighboring colors alter appearance.
The eye deserves better. Calling this merely a mistake overlooks a useful habit: vision interprets surfaces under changing illumination, and surrounding colors provide evidence about what light might be falling on them. Verification takes little effort. Sample corresponding interior pixels in both bunny images, avoiding edges where blending can introduce actual differences, then place identical crops against the same neutral background to reduce the contextual effect. Perception still has limits. Matching pixel values establishes digital sameness, not identical experience, because display settings, viewing conditions, and visual adaptation can also influence what appears before the eyes. The rabbit stays put. Only its borrowed light seems to wander.
