
This is a page-a-day diary. The hours of daylight per day have been translated into a page size.
So as the days get longer the pages get bigger, then smaller as the days get shorter.
There is no cover or back, or
beginning or end because the calendar is based on the earths orbit of the sun, which doesn't begin or end anywhere.

This is the same principal but made in a more recognised linear diary format.
You can see the day light hours curve in the page sizes.