Book Review - Diptych & Triptych Cards

On NGS group we are doing a book study of Bernie Berlin's book "Artist Trading Card Workshop". This week we're looking at the section "Diptych & Triptych Cards
Not sure what it's called but I made a four part ATC set before. Today, I made a Diptych set. Started with two backgrounds that where two different gesso resist backgrounds using the same colors. Stamped on a background image with blue StazOn ink.

Added vintage images, stamped on a large clock and wrote in a saying. They look well as one piece.

And also work as two separate ATCs.