Notebook goes from portrait to landscape, page by page

This $80 notebook starts out in the portrait aspect ratio, but as you go through it, page by page, it finally becomes a landscape oriented notebook.

Picture 1-117

Each of the 210 pages is cut to a different size, starting with the standing portrait format (18,4 x 13,3 cm), which gradually mutates to the lying landscape format (13,3 x 18,4 cm).

Link (Thanks, Craig!)