The orange paper has an exact copy of the other side of the shot glass.
Back in 1991 when my brother and I owned a screen printing company (that did everything but T-shirts) we used to make personal items from time to time.
I handled the artwork/typsetting and darkroom, plus made the screens--Ken was in charge of the machinery and tooling (makes perfect sense if you know us) and then we would do the actual printing together.
He had me pirate the art of Patty Melt whipping out her tig old bitties from a Cherry Poptart adult comic, and we shipped a couple of the shot glasses to Larry Welz (the comic's author) who then sent us the original and never-seen-before-now drawing that's in the frame.
I put milk in the glass so our printing would be legible in the photo, then drank it.
Probably the only time I have tasted white milk since we made the shotglass 18 years ago.