“Lilac Chaser” & Optical Illusion

http://www.michaelbach.de/ot/col_lilacChaser/index.html

This trick is simply known as “negative retinal afterimage” which means that, the green color is visible when looking at the given hue for several second and then looking at the neutral color. But if we just follow the dots rather than not looking at the neutral color it will not be visible. It is because of “color constancy”, we see colors independently. So if we switch the color to green and carefully observe it, we could see the magenta color. Which means the reveres is also possible. Additionally, a Gestalt effect, the “phenomenon” The afterimage from the successive retinal location is known as the single moving object, the green disk. Shortly, it is easy to fixate on the center, a Gestalt effect leads to a flying green effect and the retinal locations are re-adapted and afterimage is uncovered only shortly.

Optical illusion is visually perceived images that differ from reality of an object. It is simply worked by information gathered by the eye and it will not be tally with a physical measurement of the stimulus source.It causes the picture in a different way and unconscious inferences.Looking at this picture you can see a musicial and a girl's face.