Why don't images disappear if you look at them constantly?

Images don't disappear when you look at them constantly due to the way our visual system processes information. Our eyes and brain continuously adapt to stimuli, but they also retain the image in our visual memory, allowing us to perceive it consistently. Additionally, the phenomenon of persistence of vision means that images linger briefly on our retina, reinforcing our perception as we focus on them. This combination of factors helps maintain the visibility of an image despite prolonged gaze.