It only happens twenty-five times in each century, that odd day on the calendar, 29 February. What a great opportunity to sneak in some postal history to your mail art this year.
At the end of this month, Monday, 29 February 2016, you can gather your out-going mail art, get yourself over to your local post office and ask those nice people at the counter to hand cancel your cards and letters with the station's unique hand cancellation mark with the date.
Ready to make the leap?
OH NO Heleen, mine wasn't cancelled the 29th. What a pain.