Are you ready to put your eyes to the ultimate test? Today, we have a challenge that seems simple at first but can stump even the sharpest minds. It’s called the “Spot the 409” challenge, and it’s all ...

A visual challenge, the 'Spot the 409' test, requires participants to find a single '409' amidst numerous '406's within seven seconds. This exercise highlights how visual crowding can make subtle ...