A disk with a picture on each side is attached to a stick. When the stick is twirled quickly in the hand, the two pictures appear to blend into one. This device is called a thaumatrope that was very popular in the 19th century, before the era of television. You will learn persistence of vision in the video.
The reason you are able to see two images merge into one in this experiment is because when you see an image, it stays on your eye (or your brain?) for approximately 1/25th of a second. This phenomenon is known as persistence of vision. That’s why you can see the bird in the cage when you spin the two images. Before cartoons and movies, people used to enjoy simple
animations with a thaumatrope.
Let's explore the bird in the cage. : )
This is the 28th video(in a series of 100) to ignite curiosity and teach science in an engaging manner.
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