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Try this. Draw a cage on one side of a...

Try this.
Draw a cage on one side of a cardboard' and a bird on the other side. Hang the cardboard with the help of a thread. Twist the thread and leave it. What do you see and why?

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When a cardboard with cage drawn on one side and a bird drawn on other is tied to a thread and twisted, we get the illusion of the bird inside the cage.
These phenomena happen due to persistence of vision.
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TARGET PUBLICATION-LENSES -Apply your Knowledge
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