To help you focus, ganglion cells in the retina increase the stimulus received at the point you are looking and decreasing the stimulus from areas around the point.
Source: How to see all 12 dots in this mind-boggling optical illusion
To help you focus, ganglion cells in the retina increase the stimulus received at the point you are looking and decreasing the stimulus from areas around the point.
Source: How to see all 12 dots in this mind-boggling optical illusion