The visual representation of all the book's pages is called the page ladder.
There are various programs online for free (or you can buy them if you want) which will enable you to create this interesting thing. What the page ladder does is creates an image of what all of your pages in the documents will look like together.
Answer:
it might be at least more than 20 year
Answer:
I think it would be Art Deco, because it represents a poster. Hope I helped- :3