Architectural drawing for the RA summer show.
We used an ornate black moulding and had a QR code laser engraved into the moulding. This, once scanned would lead the viewer to the artists website.
AND IT WORKED!
We filled the engraved parts with white and skimmed the surface with black to give the contrast that the app needed and had the engraving at 8 places over the frame, 2 in each corner.
It was a brilliant balance of beauty and detail with practical functions.