https://www.reddit.com/r/woahdude/comments/8b07g3/this_picture_will_fade_away_if_you_stare_at_it/
review - https://www.theverge.com/2018/4/9/17217660/optical-visual-illusion-troxler-fading-neural-adaptation
origin - https://www.pipiscrew.com/2018/04/this-picture-will-fade-away-if-you-stare-at-it-may-take-a-minute/ this-picture-will-fade-away-if-you-stare-at-it-may-take-a-minute