Below are sites to visit if you have time to see them.
http://www.oddee.com/item_98550.aspx
http://www.pri.org/stories/2015-05-29/delightful-collection-do-not-disturb-signs-all-over-world
https://dailypost.wordpress.com/dp_prompt/do-not-disturb/
Do Not Disturb
How do you manage your online privacy? Are there certain things you won’t post in certain places? Information you’ll never share online? Or do you assume information about you is accessible anyway?