I assume you’re talking about lenticular images.
These are the guys that change as you tilt the picture back and forth.
Imagine putting both pictures thru a shredder and them putting them back together but on the same page. You take One strip from image A, then one from image B, then the next from image A and so on.
A lens is then placed over the image that blocks off one image at a time based on the viewing angle.
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