This is such a cute idea. It's a daily calendar that can be reused each year and gets better the longer you use it. Each day you write the year and something that happened that day like, "(Child's name) took her first steps." I imagine the first year wouldn't be as fun, but imagine how neat it would be in 10 years.
Throught the year get everyone in the family or If your single just yourself to write down good things as they happen during the year and place in the jar so on New Years Eve you can open it a read all the things that were great about your year