lenticular lens is what it's called I think.
This calendar does not have a lenticular lens in the way the term is typically used[]
To be clear, the calendar comes printed with one image on every other odd line, and another image on every other even line. The plastic decoder screen is clear every other line and black every other line, so it allows you to see one image or the other as you move the decoder screen across the images in the calendar. Perhaps you could argue this is 'lenticular' but usually when I see 'lenticular' used it refers to images such as the ones on the reprint book covers - where the plastic lenticular lens is glued over the original printing with different images every other line.
Neutraljedi (talk) 20:55, August 30, 2019 (UTC)