The illusion easily deceives the brain

The human brain is extremely complex but can easily be fooled by images that create optical illusions.

The process of processing information inside our brain is the basis for creating many illusions. When eye images are obscure or ambiguous, the brain will make conjectures to try to explain what it is, according to Sun.

Hallucinations of sex

The brain uses the level of face contrast to determine sex.(Photo: Sun).

In the image of Richard Russell's sexual hallucination, we look at the same face but there is a feeling that the person in the picture is a woman when the skin color is lighter (left picture) and men when the skin becomes darker. (right photo).

The cause of this phenomenon is because changing skin color affects the contrast of the face, between darker areas such as lips and eyes with brighter areas like skin. Very few people notice that face contrast is one of the characteristics to distinguish sex. In fact, female face contrast is higher than that of men.

Coffer illusion

We see images of 16 circles after only a few seconds.(Photo: Sun).

In the photo of Coffer's illusion, we initially saw a series of rectangular doors recessed inside. But after a few seconds, the brain processes information to see images of 16 circles.

The visual brain is always active, aiming to clearly identify the object while looking. Countless pixels are grouped together to form edges, borders and finally the whole object. Coffer hallucinations occur when the brain groups images in different ways.

For example, in the image above, the set of horizontal lines can form a circle, or intersect the two rectangles. For most people, grouping the edges into the original rectangle prevails. This may be because the rectangle is more popular than the circle in our daily living environment, so the brain is more familiar.

Love mask

Hallucinations appear in love mask photo.(Photo: Sun).

In Gianni Sarcone's "love mask" picture, we can see the face of a man inside a mask, or two faces of people kissing.

The illusion in the photo works similar to the Coffer illusion. Image lines can be grouped in two different ways, making the brain not know which option to choose.