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I have been racking my brain trying to think of the name of a particular type of mechanism used (mainly decades ago) for interactive children's books. It basically consists of a pull tab, which when pulled, reveals an image – however, the image is concealed in a sort of venetian blind way – sort of like outdoor billboards that change and have two sides (both sides of the image are sliced into thin strips which can rotate and reveal etc)
...so, any ideas?!