Around a hundred A6 sized cards have been sent to Margaret Huber (if that's even her real name?) since 2004 from faraway places like Japan, Finland, Spain, Russia and England.
The mail involved items like hair, fish, a sachet of white powder, a piece off a broken record etc. and the aim of the game was to test the postal system.
FYI: Only three cards never reached their destination.
Below is what the mail man had in his hot little hand at one time, or another...
But there are more. "Hair and glue" (DNA FAIL - pretty sure I don't ever want that sent to me)

"Take care labels"

"Fish and glue go well together" (So experimental.)

"Red record"

"Nearly visible 1000 yen note - That no one stole"

"Copper pipe with scratched address" (Question: Is it true that Connex trains run late sometimes because of 'copper thieves'?!)

"A bin find from Brighton"

"A sheet of seaweed" (Gross if that got wet.)

"Holy Wood from Finland" (Get it? Holy wood? Fun with pun.)

This project made it into the book
POSTCARD.