A very primitive
form of
animation, one of the many
experiments done by the same guy who did a lot of
persistence of vision experiments (and killed one of his
retinas by staring at the sun). You have a single
strip with a bunch of
frames, which you put in a
loop inside a
drum with
slots cut out so that through each
slot you see a single
frame of the loop. (This is a very common thing to see in a
Children's Museum.) When you
spin the drum (it's on a free-turning
pivot) and look through one slot, each
frame in turn passes behind it in such a way that it appears that the
strip is staying still but the looped animation is being played on each
frame. In effect, you get a very short, looping animation.