I think this means writing on a banana. I needed a breather at work one day, so I gave it a whirl.
The top banana has a secret message that I wrote with an unclicked ballpoint pen. The bottom banana is the same banana one day later. You can see my sample message and ingenious design have "developed" over 24 hours. Please note this is only a sample message. I do not really love bananas, ha!
Frugal fun for the whole family? Secret love note material? Super-spy messaging device? Practice tattoo format? You decide, my friends. The banana is your oyster!