Visual illusion 'brain pain' most: This picture is white, or black background?

The white guardian, the black man - in the end, what? Visual illusion is always a headache for all of us.

Netizens are really good people in creating highly pervasive trends. And recently, users on the Reddit forum are sharing a picture of a "visual illusion" that really causes fever.

Attached is a question that hurts everyone's brain: Is this picture white, or black?

Visual fantasy "Wallpaper".

Inside the picture are white or black cross stitches interspersed, constantly rotating. This makes the sense of the background of the image also change, at white, when black, there is no exact answer.

But why do we feel so different? According to Digg, a website specializing in answering network phenomena, this is a visual -ground fantasy perception . This phenomenon was discovered in 1915 by psychologist Edgar Rubin.

Rubin was the one who created the visual illusion of the famous "Rubin flower vase" : the same picture but the one looking out at the flowerpot, who saw two faces.

Visual illusion "famous Rubin flower vase".

According to experts, this visual illusion shows that people tend to choose what they can see. Based on the data, the brain itself will choose how to look at the picture: white background or black background.

An interesting point is that the brain can see two images in the same picture, but there will be a "dominant" image based on past experiences and thoughts.