Color Blindness Test
Test of color blindness. There is number 26 written on this plate.

In 1964, a new form of art op Art came into existence and this art form was comprised of illusion. Such arts according to the human eyes seem to be moving and breathing because of its mathematical based composition. Optical illusions are used in the print materials, in television or billboard advertisement and have been able to catch the eyes of the onlookers to a great extent. Art optical illusions became a new way of conveying the message and advertise to the general public. In reality, the art is a flat, static and two-dimensional. The art optical illusions are able to create the illusion effect so nicely because the color, line and shapes are carefully chosen to impart the maximum effect. The perspective and combination of color are two very important factors for creating these art optical illusions. In some images colored imaged are bordered by frames usually the black color and by doing so the colors used in the images seem to be more vibrant. There is a concept of “adaptation mechanism” used in optical illusion which allows the eyes to get recovered from oversensitivity to particular stimuli. Chromatic adaptation happens when the eyes adjust to certain color stimuli. Dithering is another way of creating color adapting optical illusion. In this, dots or pixels are used in such way that the viewers perceive more colors than they are actually used. The technique of creating a large color palette with a limited number of colors is used in computer images, printing industry and television also.
Stare at the center of the image and then see the moving dot changing its color to green.

Can you see any black dots at the point of intersection.
If you do, then you are wrong. Because there are not any black dots there. Its just an illusion.

Stare at the black dot in the middle of the picture and then look at colored fluff disappearing.
