From Michael’s “Optical Illusions & Visual Phenomena…This is pretty freaky, you stare at the green dot in the middle, as the background grid turns the yellow dots will disappear. Steady fixation favours disappearance, blinks or gaze shifts induce reappearance. All in all reminiscent of the Troxler effect, but stronger and more resistant to residual eye movements. Might be cool to make a video game that has this effect.