René Rodriguez on Instagram: "The negative picture illusion is a fascinating demonstration of how negative afterimages create surprising visual effects. In this illusion, your brain and visual system transform a negative image into a full-color photograph. To experience this, stare at an image of a face for 30 seconds to a minute. Then, shift your focus to the X in the center of a blank white screen and blink several times. This works because the photoreceptors in your eyes become overstimulated