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There's really no magic
at work in the MAGIC WAND. A projector produces a real image in
space. Waving the wand provides a surface for the image to reflect
from, so the light can get into the viewer’s eye. Persistence
of vision—the eye's capacity to retain an image for a short
period of time—lets the brain see the moving reflections from
the stick as one whole picture. Other images in space can be found
by waving the wand closer to or farther away from the projector,
but only one image is in focus.
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