Type6: illusion about color

 Have you ever seen illusion about color?

 You will think what it means. Illusion about color, that is to say, illusion that trick human by using human's recognition about color. In this topic, you will become aware of your eyes' ambiguity. But believe yourself!

 

 Look at this picture. I will say an astonishing fact. A and B is same color! I have never believe it. But it is fact. It is illusion. We are neatly taken in. If you can't believe (I think you can't believe), look at below picture. Still, if there is someone who can't believe, use the PaintSoft to examine the fact by yourself.

 Next picture must surprise you, too.

 

 You will think there are many lozenges that are four different colors. But it is wrong. These lozenge are all same!! In fact, one lozenge have gradation of color in it. The gradation makes this illusion. You must also doubt it. But below moving image make you feel clear. This causes by the contrast of lozenge's edge. In every boundary, above parts are darker than below parts, so eyes are tricked.

 Please obey the words written in the picture. Can you see the building that is colorful? But the building is actually black and white image.
 This illusion occur because of the cone cell. If you stare at same color long time and cone cell
accustomed the color, cone cell send signal of opponent color to the brain. Opponent color means, for example, red-green and yellow-blue. This theory is proposed by Hering. Ewald Hering was a German physiologist who did much research into color vision and spatial perception. He proposed opponent color in 1892. This is hard to explain, so if you want to know detail, please check this URL. http://www.brl.ntt.co.jp/IllusionForum/v/colorAfterimage/ja/index.html
 There are many pictures about illusion. So I introduce some of them. Please enjoy!

The knack to see colorful picture is staring only one point and being careful not to move your eyes.

Next one is Munker illusion. Do you think there are four colors in yellow and blue stripe? In fact, there is only two colors. Above two rectangles are both red, and below two rectangles are both green. But you will feel right two rectangles are lighter than left. This illusion caused by phenomenon of assimilation. It means that the surrounding color influences the surrounded color. In above picture, right side rectangle' edge are surrounded by yellow more than blue. So right side are seen light. On the other hand, left side rectangle' edge are surrounded by blue more than yellow. So left side are seen dark.



Last picture is little difficult to understand. But if you understand it, you will be impressed.

 Now, you will think that there is blinking pink balls. It is right. Don't worry. But you can try another viewpoint!
 At first, be close to the picture and gaze on the center cross mark few minutes. So you will see a green ball revolving around the mark. And try to keep gazing more. Finally, you will notice that there is only green ball revolving. Can you see it?




How about illusion about color? Our brain has evolve to live. The transmission between brain and the optic nerve. But if we use the mechanism, our brain can be tricked easily. I think it is very interesting.

Next week is trick picture that can be made easily from our daily life. Don't miss it!