Answer 1:
The reason we can enjoy movies and actually see
them as moving images instead of just a series of
pictures is because we are fooling our brains.
When our eyes detect an image it takes a certain
amount of time to send the image to the brain.
The brain then processes the images and
determines what it is. However, if the images are
coming at the brain very fast (between 25 and 60
images per second), the brain does not have enough
time to process each individual image so instead
it just interprets it as motion (If you are
curious, movies are shown at 24 frames per second
and TV is broadcast at 30 frames per second).
The
concept was discovered in 1834 by William George
Horner. Horner invented the first basic motion
picture projector, also called a "Zoetrope". A
zoetrope is a cylinder with slits along the edge
and images painted on the inside. As it spins, the
images appear to moving. This link has great
instructions on building your own Zoetrope:
zoetrope
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