Apparatus for displaying still images to viewers in motion relative to
those images, such as passengers on a subway train, includes a plurality
of images mounted on a surface, and a slitboard mounted between that
surface and the viewer. As the viewers pass by, the slitboard acts like a
shutter, creating an animation effect. In addition, there is a stretching
or widening effect that enlarges the images, allowing images to be
"preshrunk," thereby allowing a large number of images in a small space,
increasing the available frame rate of the animation. The stretching
effect depends on the distance between the image surface and the
slitboard.
