Ilusión óptica de desvanecimiento de Troxler

2x2 grid, 16:9, Ai infers subjects: Anchor: A central hard fixation dot surrounded by [PERIPHERAL ELEMENTS (e.g., a ring of muted pastel blobs / a soft-edged colour field / a faint subject silhouette in the periphery)] that fade completely and are replaced by the background within seconds of steady fixation ::4 Perceptual Mechanism: Troxler fading. Under fixed central fixation, neurons coding unchanging peripheral input adapt and the visual system fills the region with the surrounding value. Strongest for soft-edged, low-contrast, desaturated peripheral stimuli - sharp, high-contrast elements keep re-triggering and never fade ::4 Morphology: One sharp central fixation dot. All peripheral elements soft-edged, feather radius [X]px, NO hard boundary anywhere in the periphery. Contrast against the ground kept deliberately low. The fixation dot is the only crisp thing in the image ::3 Material Physics: Flat digital fill with heavy edge feathering on peripheral elements only. Muted, desaturated periphery; low luminance separation from background. No texture ::3 Illumination: None. The disappearance is neural adaptation, not any rendered fade ::2 Viewing Protocol: Fixate the center dot without moving the eyes; periphery vanishes in roughly [10]s and returns the instant the eye moves. The stillness of the gaze is the mechanism ::2 Render Stack: Troxler fading, peripheral adaptation demonstration, soft pastel field, minimal fixation stimulus ::1 Failure Condition: Any hard edge or high-contrast element in the periphery resists fading - the eye re-registers it and it never disappears ::-1 Negative: [hard-edged peripheral elements, high contrast, saturated peripheral color, sharp boundaries, texture, moving elements, second fixation point, dark high-contrast surround] ::-1