Old out house (Grandpa, Dad or my great uncles didn't put a half-moon on the door. But there was space just under the edge of the front room that had chicken wire to put a little light on the subject. :)
A Drawing of an Outhouse with a Heart on the Door entitled "Heart's Content" Drawn by Martha Hinson
If you think about it; its pretty amazing how long some old barns stand, and speaks of great craftsmanship.