Writing on the Front Side of Postcards

I was hesitating about sending this postcard to Heleen (the Netherlands), not sure if postal machines would be able to read the address and find the stamp on the front side of the postcard... But it eventually arrived. 

And the same week, John (the UK) had a similar idea. Not the address, but he wrote the message on the front side, in the form of an old telegram:

Actually, the postcard is a reproduction of a greeting telegram for Valentines Day (Rex Whistler, 1936), from the British Postal Museum & Archive.

I Got up At...

On Kawara is a Japanese artist living in New York. Between 1968 and 1979 he created and sent several series of mail named I'm still Alive and I Got Up At. In the postcards he wrote or rubber-stamped the artist's time of getting up, the date, the place where the postcards was sent from.

The length of each series ranged from a single piece of mail to hundreds sent consecutively over a period of months.

Not exactly boring correspondence! For instance, in 1973 alone he sent postcards from twenty-eight cities.