If a small piece of art has different measurements than this, it does not qualify as an ACEO.
The acronym "ACEO" stands for Art Cards, Editions and Originals.They can be original art, print editions or photographs. The majority of ACEOs are two dimensional, but three dimensional elements may also be incorporated.
Pop-ups, books, collages, and sculpture can all be ACEOs as long as they measure 2-1/2" x 3-1/2".
So I've decided to create some ACEO's.
I've done 3, in acrylics and ink on watercolor paper.
Mounted on 3/4" thick blocks of wood as a "set".
Currently listed on Ebay - HERE.