This is a practical demonstration of the so-called Troxler effect. It can be used as a simple test of your ability to focus on a target. If you stare at one point for a longer time and truly keep your gaze fixed on it, your brain gradually starts to ignore everything else around it. It stops processing unchanging things in your peripheral vision and you stop noticing them. That’s because the brain receives a huge amount of information and constantly has to choose what to pay attention to. 💚 🎯Y