Persistence of vision
Twirling disc super imposes images upon each other by means
of perpetual phenomenon known as the persistence of vision Our eyes hold on to
images for a split second longer than they are actually projected so that a
series of quick flashes are perceived.
This means that when you move the image fast enough your eyes hold the image of the bird and you will see the bird in the cage. Examples of this are shown in the images below.
This means that when you move the image fast enough your eyes hold the image of the bird and you will see the bird in the cage. Examples of this are shown in the images below.
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