An interesting statistic would be the number of calendars purchased per year (and then subsequently thrown away the following year). —Preceding unsigned comment added by 220.127.116.11 (talk) 20:32, 29 December 2008 (UTC)
Hmm... I was really curious as to the history of physical calendars. Wikipedia has tons to say on the history of the concept of the calendar, but nothing, really, on whether or not you could find a wall calendar in people's houses by the late 17th century, say. I suppose that I won't be able to write a physical calendar on the wall in my book, since I can't find any information on the subject. Oh well.