If you Continue to stare at this green picture you should see a giraffe.

You might have came across many things, not like above one , in our life that appeared to you what they are not actually. I am talking about Visual Illusions. How it becomes possible to deceive human visual system? how come that with your eyes wide open you see that doesn’t corresponds to physical reality ? There is a very interesting and simple phenomena behind the science of Visual Illusion.Here I am going to explain you how these things tricks your mind.

We as human group things in four major categories similarity, continuity, closure and proximity. Our brain always looks for some kind of patterns and continuity, as we group same colored part of an image as an object or a particular shape. In closure the human brain tries to find views of familiar objects. In proximity human brain tries to group all those objects that are places together.  One thing to not here is difference between hallucination, as hallucination is the phenomena in which any object appears to exist in spite of its absence. No doubt all this involves a major contribution of  the principles of light and how human eye interprets this light. Now you got an idea of how these illusions trick your mind and make you fool. The video below helps you to understand and know how to create Visual Illusions.