Observation test: Only a person with eagle-sharp eyesight can spot '409' in just 7 seconds

A visual challenge, the 'Spot the 409' test, requires participants to find a single '409' amidst numerous '406's within seven ...

How many Black Dots can you see in this Confusing Peripheral of a Grid of Intersecting Straight Lines Optical Illusion?

An optical illusion is a visual phenomenon where our perception of an image differs from objective reality. This image is ...