Share 'Barcode Mail Art'

Barcodes. They are everywhere, but surprisingly not used that often in mail art.  When I received this piece of Barcode mail art (named 'Variation on a barcode Op. 99') thanks to Dean, Artist in Seine, I wanted to post it in the IUOMA Barcode Mail Art group. However... I couldn't find any Barcode group!.. That's why and how this group started here. You can post your received or sent Barcode…