For all this to work properly, everything has to be printed with incredible precision. The lenticles have to be exactly the same size as the printed strips underneath them and lined up with them exactly. Not only that, the image has to be adjusted and printed so that it looks exactly right when viewed through a certain piece of lenticular poster(with a certain "pitch"—or number of lenticles per inch) at a certain viewing distance. (That's a fiddly technical process and I won't go into the details here, but you can find out more in the articles and videos in the further reading section below.)