In the block, people move in and out but we have a communal postbox. This means that the postbox gets regularly stuffed with mail for people who no longer live in the block. Kat was one of these people who moved out last year, and I make a point of trying to return mail to sender to try and reduce the amount coming in.
Occasionally, to keep things interesting I try and match the mailart image I draw on these returns to the subject, so this one had to be a cat.
Very stylish moggy! And a communal postbox is a great source of return-to-sender material.
I do find that adding illustrations makes these RTS mails much harder to put in the post!