Persistence of vision

What is persistence of vision?

Persistence of vision is the illusion created by the delay of which we see images. We see an image for a fraction of second after we have seen it. As a result, we are seeing an image which is presented in front of us and the image presented in front of us a fraction of a second ago.



Below is an example of persistence of vision: 




As you can see in the video, the wand when still portrays lights in a line. Nothing more that LED lights lit up in a vertical line. However, when the wand moves back and forth at a certain speed we begin to an illusion of letters forming.


The thaumatrope and roller work as they do because the movement of images creates an illusion. There are two images in both thaumatrope and roller which are connected together by revealing one after another. When the movement between images reaches a certain speed the human eye begins to see the image in front of them and the image a fraction of a second ago. The human eye has the ability to retain an image for a short amount of time therefore creating the illusion of a sequence of images being connected. 
When you look through a narrow slit, you can see only a thin strip of the world around you. But if you move the slit around rapidly, your eye and brain combine these thin strips to make a single complete picture.

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